Ted Cruz Says He Won’t Support Donald Trump For Attacks on His Wife and Father

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Texas Sen. Ted Cruz said Thursday that he has no obligation to act like a “servile puppy” and vote for someone who insulted his wife and his father, defending the controversial convention speech in which he declined to endorse Donald Trump and was booed off stage.

“I am not in the habit of supporting people who attack my wife and attack my father,” said Cruz, explaining that he would not vote for Democratic nominee Hillary Clinton but would also not endorse Trump, according to the Associated Press.

“What does it say when you stand up and say, ‘Vote your conscience,’ and rabid supporters of our nominee begin screaming, ‘What a horrible thing to say,'” Cruz said, speaking to the Texas delegation in Cleveland on Thursday morning.

Scenes from the Republican National Convention

Republican National Convention, Cleveland, Ohio.
Republican presidential candidate Donald Trump and Republican vice presidential candidate Mike Pence stand with their families at the end of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland.Christopher Morris—VII for TIME
Republican National Convention, Cleveland, Ohio.
Attendees celebrate as the Republican National Convention comes to a close on July 21, 2016 at the Quicken Loans Arena in Cleveland.Christopher Morris—VII for TIME
Duck Dynasty reality TV star Phil Robertson on the floor at the 2016 Republican National Convention in Cleveland on Thursday, July 21, 2016.
Duck Dynasty reality TV star Phil Robertson on the floor at the 2016 Republican National Convention in Cleveland on Thursday, July 21, 2016.Landon Nordeman for TIME
Scenes from the floor at the 2016 Republican National Convention in Cleveland on Thursday, July 21, 2016.
Scenes from the floor at the 2016 Republican National Convention in Cleveland on Thursday, July 21, 2016.Landon Nordeman for TIME
Scenes from the floor at the 2016 Republican National Convention in Cleveland on Thursday, July 21, 2016.
Scenes from the floor at the 2016 Republican National Convention in Cleveland on Thursday, July 21, 2016.Landon Nordeman for TIME
Donald Trump kisses running mate Indiana Gov. Mike Pence at the Republican National Convention on July 20, 2016, in Cleveland.
Donald Trump kisses running mate Indiana Gov. Mike Pence at the Republican National Convention on July 20, 2016, in Cleveland.Christopher Morris—VII for TIME
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Scenes from the floor at the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.Landon Nordeman for TIME
TIMEPOL RNC
Scenes from the floor at the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.Landon Nordeman for TIME
TIMEPOL RNC
Scenes from the floor at the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.Landon Nordeman for TIME
Donald Trump with his children Eric and Ivanka Trump at the Republican National Convention in Cleveland, on July 20, 2016.
Donald Trump with his children Eric and Ivanka Trump at the Republican National Convention in Cleveland, on July 20, 2016. Benjamin Lowy for TIME
A man poses at Instagram's "Mini Oval" office at the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.
A man poses at Instagram's "Mini Oval" office at the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.Landon Nordeman for TIME
Donald Trump supporter Rachel Day, from Akron, stands outside the Republican National Convention in Cleveland on Wednesday, July 20, 2016.
Donald Trump supporter Rachel Day, from Akron, stands outside the Republican National Convention in Cleveland on Wednesday, July 20, 2016.Landon Nordeman for TIME
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Troopers monitor protests outside the Republican National Convention in Cleveland on Wednesday, July 20, 2016.Benjamin Lowy for TIME
Mounted police from Fort Worth, Texas monitor the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.
Mounted police from Fort Worth, Texas monitor the 2016 Republican National Convention in Cleveland on Wednesday, July 20, 2016.Landon Nordeman for TIME
Attendees hold signs at the Republican National Convention in Cleveland.
Attendees hold signs at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Benjamin Lowy for TIME
New Jersey Gov. Chris Christie attends the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.
New Jersey Gov. Chris Christie attends the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.Landon Nordeman for TIME
A man attends the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.
A man attends the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.Landon Nordeman for TIME
Attendees hold signs at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Attendees hold signs at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Christopher Morris—VII for TIME
A Texas delegate tallies up the votes for the Donald Trump's nomination at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
A Texas delegate tallies up the votes for the Donald Trump's nomination at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Benjamin Lowy for TIME
Donald Trump speaks at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Donald Trump speaks at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Landon Nordeman for TIME
Delegates cheer at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Delegates cheer at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Landon Nordeman for TIME
Comedian Eric Andre is escorted from the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Comedian Eric Andre is escorted from the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.Landon Nordeman for TIME
Boxing promoter Don King attends the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Boxing promoter Don King attends the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Landon Nordeman for TIME
Donald Trump Jr. speaks at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Donald Trump Jr. speaks at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Christopher Morris—VII for TIME
Tiffany Trump speaks at the Republican National Convention in Cleveland on July 19, 2016.
Tiffany Trump speaks at the Republican National Convention in Cleveland on July 19, 2016.Christopher Morris—VII for TIME
A screen displays the state flag of Mississippi, the only state that includes the Confederate battle emblem in its official state flag, at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
A screen displays the state flag of Mississippi, the only state that includes the Confederate battle emblem in its official state flag, at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Christopher Morris—VII for TIME
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Scenes from the floor at the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.at the Republican National Convention in Cleveland.Landon Nordeman for TIME
Buttons are displayed for sale outside the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016.
Buttons are displayed for sale outside the 2016 Republican National Convention in Cleveland on Tuesday, July 19, 2016. Landon Nordeman for TIME
A pair of men interact with protesters in the Cleveland Public Square at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.
A pair of men interact with protesters in the Cleveland Public Square at the Republican National Convention in Cleveland on Tuesday, July 19, 2016.Benjamin Lowy for TIME
Trevor Leis, of Lime, supports open carry at the Cleveland Public Square amidst various protests at the Republican National Convention in Cleveland on July 19, 2016.
Trevor Leis, of Lime, supports open carry at the Cleveland Public Square amidst various protests at the Republican National Convention in Cleveland on July 19, 2016.Benjamin Lowy for TIME
A police officer stands on a protective crowd control line in the Cleveland Public Square at the Republican National Convention in Cleveland on July 19, 2016.
A police officer stands on a protective crowd control line in the Cleveland Public Square at the Republican National Convention in Cleveland on July 19, 2016.Benjamin Lowy for TIME
Delegates pose for a group photo at the Republican National Convention on Monday, July 18, 2016, in Cleveland.
Delegates pose for a group photo at the Republican National Convention on Monday, July 18, 2016, in Cleveland.Landon Nordeman for TIME
A man dons a "Make America Great Again" hat at the Republican National Convention in Cleveland.
A man dons a "Make America Great Again" hat at the Republican National Convention in Cleveland.Benjamin Lowy for TIME
Melania Trump kisses her husband, Republican presidential candidate Donald Trump, to the applause of the ecstatic crowd, on July 18, 2016.
Melania Trump kisses her husband, Donald Trump in front of an ecstatic crowd, on July 18, 2016.Ben Lowy for TIME
Scenes from the floor of the 2016 Republican National Convention on Monday, July 18, 2016, in Cleveland.
Scenes from the floor of the 2016 Republican National Convention on Monday, July 18, 2016, in Cleveland.Landon Nordeman for TIME
Donald Trump appears on stage at the 2016 Republican National Convention on Monday, July 18, 2016, in Cleveland.
Donald Trump appears on stage at the 2016 Republican National Convention on Monday, July 18, 2016, in Cleveland.Landon Nordeman for TIME

“If we can’t make the case for the American people that voting for our party’s nominee is consistent with voting your conscience, is consistent with defending freedom and being faithful to the Constitution, then we are not going to win and we don’t deserve to win,” he said.

During the course of the Republican primary, Trump criticized the appearance of Cruz’s wife, Heidi, and also made an unfounded accusation that Cruz’s father was linked to the assassination of President John F. Kennedy.

Read more: Donald Trump and the Truth About Lee Harvey Oswald and Cuba

“What I said last night is what I believe is the only path to saving our country, and it is not simply blindly chanting a name and yelling down dissenters,” Cruz said. “I am going to tell the truth each and every day, whether or not it is politically helpful or convenient.”

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Write to Katie Reilly at Katie.Reilly@time.com