R epublicans have had a tough stretch. They were defeated in elections in the fall and find themselves at risk of losing control of one or maybe both chambers of Congress later this year. Their standard-bearer, President Trump, has tumbled in the polls and finds himself underwater on his two signature issues, the economy and immigration. There has been unrest in a major American city, and blood shed by Trump’s federal agents. Republicans’ whispers have grown louder in recent weeks: Trump is