By Justin Worland
April 7, 2016

European Union officials may require U.S. and Canadian citizens to apply for visas before traveling to member states, according to a report.

The threat, reported by Reuters and attributed to anonymous sources, comes as the E.U. negotiates a trade agreement with the U.S. While most European citizens can enter the U.S. under a visa waiver program, U.S. officials have refused to lift visa requirements for citizens of some European countries including Romania, Bulgaria and Poland.

President Obama will travel to Europe this month and engage in ongoing discussion on a transatlantic trade agreement, known as TTIP. “A political debate and decision is obviously needed on such an important issue,” an E.U. source told Reuters. “But there is a real risk that the E.U. would move towards visas for the two.”

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