The North Carolina Republican had already made up his mind to leave the Senate, but the run-in with the president over Medicaid moved up the timeline of the announcement.

NC, had told fellow Senators in the days before the vote on Trump's budget that it will kick more than 600,000 North Carolinians off their health insurance if it becomes law.

U.S. Sen. Thom Tillis, a North Carolina Republican, broke with his party Saturday and said he would not support the federal “One Big Beautiful Bill Act,” the sweeping budget package that would enact much of President Donald Trump’s agenda.