Tennessee Republican Sen. Bob Corker on Thursday withheld an endorsement for President Donald Trump's re-election bid, adding that it is "questionable" whether Trump will even seek a second term in office.
"I have no idea whether the President will run for re-election nor what the field will be on the Republican side, so I think it's way too early to weigh in on who won my support," Corker told CNN's "New Day" co-anchor Alisyn Camerota.
"But are you saying you're not sure the President is going to run?" Camerota asked.
"I'm definitely not sure if he's going to run," Corker replied.
CNN reported Thursday that Senate Majority Whip John Cornyn, Tennessee Sen. Lamar Alexander and South Carolina Rep. Mark Sanford are among the Republicans who are holding out their official support for Trump in 2020.
Wisconsin Sen. Ron Johnson also refused to endorse the President, telling "New Day" earlier Thursday that "it could be a completely different world by 2020."