Eliza Collins

USA TODAY

As some Republicans struggle with justifying their support for Donald Trump after a series of controversies — including his recent attack on an American-born judge for his “Mexican heritage” and a doubling down on his call for a temporary ban on Muslims entering the U.S. — the two Republican senators from Tennessee aren't lending their overt support.

Sen. Lamar Alexander isn't calling Trump the GOP nominee just yet, as reported by an Associated Press reporter.

When his office was asked about the comments, Communications Director Jim Jeffries confirmed them and said, “Republicans officially choose our nominee in July. Sen. Alexander has said he will support the Republican nominee when we have one.”

And Sen. Bob Corker told reporters at the Capitol that Trump's speech following the worst mass shooting in American history "wasn't the type of speech one would expect" from a presidential candidate.

“In an effort to be constructive, I have offered public encouragement at important times, but I must admit that I am personally discouraged by the results," Corker said, according to his office. Corker has been mentioned as a possible vice presidential pick for Trump.