The decision is a setback for President Donald Trump, who has argued the requirement is needed to restore public confidence in elections. But the judge allowed other parts of Trump’s sweeping executive order on U.S. elections to go forward for now, including a directive to tighten mail ballot deadlines around the country.

Attorney Katie Zacharia analyzes a judge blocking part of President Donald Trump's election integrity executive order on 'Fox News @ Night.'

A U.S. judge on Thursday blocked parts of President Donald Trump's executive order seeking to impose new rules on federal elections, which Democrats and other groups said risked denying eligible citizens the right to vote.