Republican Sen. Mike Lee of Utah said Monday he doesn't know if he'll support Donald Trump for president, the leading Republican in the race.
Lee endorsed Texas Sen. Ted Cruz last month, but he was asked during an appearance on WTMJ's Charlie Sykes Show out of Milwaukee if he has decided to throw his support behind Trump if he is the party's nominee.
"I haven't, because there are too many unanswered questions. I would need to know where he stands on a lot of the issues," Lee said.
"Federalism, separation of powers, the fundamental purpose of government. How he reads the enumerated powers of the federal government. I haven't heard a whole lot of detail. In fact, I haven't heard any detail from Donald Trump when it comes to any of those questions."
Lee said he is supporting Cruz' White House run "because he's the only Republican in the race who can defeat both Donald Trump and Hillary Clinton."
Lee, who first took office in 2011, said it's "too early to say" whether he would endorse a third-party conservative candidate in the presidential race.
Trump's presence in the campaign has ruffled many feathers, including many Republican party insiders. There has already been talk of holding a
contested convention this summer, meaning Trump could lose the nomination even if he has a lead in delegate votes.