Mitt Romney, the failed 2012 presidential candidate and Utah Republican senator is facing a backlash from Republicans for voting against Donald Trump in his impeachment trial on Wednesday.
Romney spoke on the Senate floor ahead of his vote to say "the president is guilty of appalling abuse of public trust," and that what he "did was wrong, grievously wrong".
Republican figures, including Trump himself, have slammed him as a "sore loser" and a secret Democrat, reports BBC.
Influential figures in conservative media called on Romney to step down from the Republican Party, with one claiming that she would move to Utah to run to unseat him in 2024.
And on Thursday morning, President Trump took a swipe at him when addressing the National Prayer Breakfast, criticising people who use their faith to justify "wrong" actions.
Holding up a newspaper headline with "Acquitted" emblazoned across the front page, the president also decried "corrupt" Democrats as House Speaker Nancy Pelosi sat four seats from the podium.
Trump was acquitted in the Senate, despite Romney's history-making lone dissent vote.
This is the first time a US senator voted to remove a president from their own party.