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.

G OP Sen. Thom Tillis was back on Capitol Hill on Monday as Senate Republicans struggled to pass their "One Big Beautiful Bill Act" he opposes -- before President Donald Trump 's July Fourth deadline.