Sen. Ben Sasse’s (R-Neb.) expected retirement from the Senate is the latest sign that is it harder to be a Republican critic of former President Trump in Congress than a loyal ally. Sasse is one of seven Senate Republicans who voted to convict former President Trump last year during his impeachment trial over the Jan. 6, 2021, attack on the Capitol. He’s the third to retire. The Nebraskan senator not that long ago was also seen as a rising star in his party and a possible presidential candidate. But that possibility seemed more and more faint as Sasse’s opposition to...