Some lawmakers and commentators have turned their attention to the possibility that Republicans in Congress could try to block Democrats from assuming the majority.
The party apparatus is taking advantage of its enormous war chest, as well as a Supreme Court campaign-finance ruling this year, to send tens of millions into congressional races.
Vice President JD Vance, appearing at a rally in Harlingen, Texas, for some of the Republican candidates in the state, has led the party’s finance operation.
With just two weeks to go until the midterms, President Trump’s itinerary reflects how worried the G.O.P. is about its holding onto the House and Senate.
Our White House correspondent Tyler Pager traveled with President Trump as he campaigned across the country ahead of the midterms. As the president touted his record, political drama mounted in Washington.