Flake. Corker. Romney.
And now, Sen. Thom Tillis.
The roll call of Republican senators in the U.S. Congress who have called it quits, rather than endure a political career sideways with President Donald Trump , is long, notable -- and apparently, still growing.
Tillis, the GOP senator from North Carolina, announced his decision not to seek reelection Sunday, a stunning moment, given its timing.
It arrived a day after Trump trashed Tillis online, threatening to campaign against him, after the senator revealed he would oppose Trump's big tax breaks bill because of its deep cuts to Medicaid that he warned would devastate his state.