GOP senators won't commit to endorsing Trump in 2020

Sen. Bob Corker says it's 'questionable' whether Trump will even run again.

The president announced in February that he would run for a second term, and has already named his 2016 digital strategist Brad Parscale as his campaign manager.

Corker added during the interview that he would like to see who else is included in the field of 2020 Republican candidates before making a decision on who to endorse.

He has been asked several times in recent days if he would support the president for re-election.

Just yesterday, he said his position changes by the hour and that many of his colleagues are likewise conflicted.

“Any Republican senator that hasn't been conflicted over this presidency is either comatose or is pretty useless in their blindness,” Corker said during a breakfast with reporters Wednesday.

"It could be a completely different world by 2020. We have a 2018 election first," Johnson said. Johnson, who was re-elected to his seat in 2016, has said that he will not seek re-election again.