“There are three branches of government,” said Senator John McCain, Republican of Arizona. “We now have a majority in both houses. And both majorities I think hold to basic conservative Republican principles.”…

“There are some of us who will be pushing to get back to the roots of the party: limited government, economic freedom, individual responsibility, free trade,” Mr. Flake said. “Those are things that the party has stood on for a long time.”…

“The incentive for many of these members will be to follow Mr. Trump’s lead because he won many of their states,” said Kellyanne Conway, the president’s campaign chief turned senior White House adviser.

Aiming at perhaps the most powerful congressional Republican, and one of the more orthodox conservatives, Ms. Conway pointedly recalled Speaker Paul D. Ryan’s inability to carry his own state in 2012 as the party’s vice-presidential nominee.

“Speaker Ryan knows Romney-Ryan lost by seven points in Wisconsin, and Mr. Trump just won the state,” she said.