If you are a Republican in a competitive congressional race this year, whether you invite President Trump to campaign for you may depend on whether you are running for House or Senate.

Republicans could easily lose the House if Democrats run the table in suburban districts where “The Resistance” is strong and the affinity of college-educated GOP-leaning voters for their party’s new populist branding is weak. Republicans are defending a 23-seat majority in the House; there are as many GOP-held districts that went for Hillary Clinton in 2016.