Sen. Ted CruzTed CruzOvernight Defense: Senators go to White House for North Korea briefing | Admiral takes 'hit' for aircraft carrier mixup | Lawmakers urged to beef up US missile defense Senators get North Korea briefing in unusual WH visit Overnight Tech: FCC chief unveils plan for net neutrality rollback | Tech on Trump's sweeping tax plan | Cruz looks to boost space industry MORE (R-Texas) said Sunday that President Trump's wiretapping claims should be looked at seriously.
"I don't know what basis the president has for these allegations. They are serious allegations," Cruz said on CBS's "Face The Nation."
"We should examine what the evidence is. I think it would be quite good for the administration to put forward what evidence there is ... This is not necessarily as outlandish as everyone in the press suggests."
"We do know that the IRS, for example, targeted citizens groups who spoke out in defense of the Constitution, who spoke out against Obama," he said.
"And so the notion is not necessarily outlandish, but it's serious, so it needs to be based on facts."
The president earlier this month claimed former President Obama had wiretapped Trump Tower before the election.
The president last week defended the unsubstantiated claim, saying that the word "wiretap" "covers a lot of different things."
“I think you’re going to find some very interesting items coming to the forefront over the next two weeks," Trump said during an interview last week on Fox News.