By Tessa Berenson
Updated: May 4, 2015 8:45 AM ET

Carly Fiorina, the former CEO of Hewlett-Packard, said Monday that she’s running for president in 2016, joining an increasingly crowded field for the Republican nomination.

Fiorina, who mounted an unsuccessful 2010 campaign for U.S. Senate in California and has never held elected office, made the announcement during an interview on ABC’s Good Morning American and in a subsequent Twitter message. She was set to hold a conference call with reporters later Monday morning.

Fiorina is the only woman in the emerging GOP field and has positioned herself as a vocal opponent to Hillary Clinton, the prohibitive Democratic front-runner. An anti-abortion conservative friendly to the business wing of the Republican Party, she has been pitching herself as the candidate who can most credibly court women voters, a constituency with whom Republicans have struggled in recent presidential elections.

She gave a well-received speech at the Conservative Political Action Conference this year, but she’s widely considered a long shot for the nomination and has barely registered in early polls.

Fiorina is releasing a new book Tuesday, which opens up about personal struggles she’s faced, including losing a daughter and fighting cancer.

Write to Tessa Berenson at tessa.berenson@time.com.

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