Donald Trump’s campaign shakeup and new plan to run more directly against the Washington establishment could force more defections by mainstream Republicans who are increasingly worried about preserving their House and Senate majorities.
House Speaker Paul Ryan and other congressional Republicans will be under added pressure to decide whether to stick with Trump or campaign more openly to keep Congress in Republicans hands as a check on a future President Hillary Clinton.
At the same time, Trump’s decision to hire Stephen K. Bannon, executive chairman of crusading right-wing website Breitbart News and a former Goldman Sachs banker, as chief executive of his campaign has buoyed the most conservative Republican lawmakers, who are eager to see the real-estate mogul stay the course that helped him triumph in the Republican primaries.
Either way, the changes complicate what was already a difficult task for congressional Republicans to defend their majorities in both chambers and hold together a splintering party.
Under Bannon, Breitbart News has targeted establishment Republicans, including former Speaker John Boehner. As part of Trump’s move, the Republican presidential nominee plans to restore a full-bore anti-establishment tenor to the campaign, ending sporadic efforts to moderate his tenor and reach out to skeptical Republicans and independents, according to a person familiar with the matter.

Pressure on Fence-Sitters

Representative Charlie Dent of Pennsylvania, who made clear in early August that he won’t be voting for Trump, said Bannon’s hiring could push some Republican congressional fence-sitters to take a firm stance on Trump.
"It might give them more incentive to make a decision one way or the other," Dent, co-chairman of a group of about three dozen House centrists, said in a telephone interview.
"It will be kind of hard to just try and not say anything," he said of Republican candidates. "It just seems to me that this campaign has been largely run by the candidate himself and this shake-up is just another indication of disorder ahead."
But Representative Mark Meadows of North Carolina called Trump’s move a good prescription for worried congressional Republicans.