Donald Trump’s revenge tour against Republican dissenters is in full swing. Will it backfire?

With razor-thin majorities in Congress, the US president needs the votes of the very people whose careers he has destroyedAs Abba’s Dancing Queen played, Donald Trump walked across a lawn featuring cornhole, oversized Connect Four, a ferris wheel and a food tent offering short ribs, mac and cheese and apple pie. Members of Congress and their families had come for the annual White House picnic. But not every member of Congress.Missing the fun was Thomas Massie, a longtime thorn in the US presiden...