A federal judge on Thursday blocked President Donald Trump from implementing an executive order that requires voters to show documentation proving their U.S. citizenship to cast a ballot in federal elections. U.S. District Judge Colleen Kollar-Kotelly, a Bill Clinton appointee, granted a preliminary injunction stopping the Trump administration from going forward with the proof-of-citizenship requirements as a lawsuit plays out, the Associated Press reported. The lawsuit, filed by the Democratic National Committee and leftist voting rights groups, claims that Trump’s order is “an unlawful action that threatens to uproot our tried-and-tested election systems and silence potentially millions of Americans.”