Dozens of Republican senators are silent on endorsing Trump

Republican Sen. Josh Hawley of Missouri says he thinks former President Donald Trump will ultimately be the GOP nominee for president. But he hasn't taken the step of making a full endorsement in the primary campaign.

"No offense to anybody else who's running, but I just said I don't think the primary is a real contest. I think he's going to be the nominee, and I will absolutely support him against the current president," Hawley said. 

It's a consistent narrative on Capitol Hill. Many Republicans who supported Trump in his two previous presidential campaigns believe he has already clinched the GOP nomination for president, given his commanding lead in the polls, and they say there's no need for them to endorse him.