The president has had a consequential impact on the Republican membership of the Senate as resistors are replaced by devotees. Most incumbents, even those not inclined to, have fallen in line.

“Mitt Romney’s term in the Senate will be remembered. A former presidential standard-bearer, he represented an alternative vision of the Republican Party, one that prizes very different values than ...

Since Trump’s return to the White House in January, and particularly in the past few weeks, Republicans in control of the ...