Sen. Marco Rubio Marco Antonio RubioGOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' Graham vows GOP will accept election results after Trump comments MORE (R-Fla.) on Sunday defended special counsel Robert Mueller's "stellar" reputation and ability to "conduct a full and fair and thorough investigation" on possible collusion between Russia and the Trump campaign.

"I believe he is going to conduct a full and fair and thorough investigation that we should have confidence in," Rubio told CNN’s “State of the Union.”

"I’ll continue to believe that based on his reputation and years of service to our country unless there’s any evidence to the contrary," Rubio said.

Rubio's comments contradict recent efforts by President Trump’s legal team to attack Mueller’s integrity as special counsel. The team is raising concerns that Mueller's prior relationship with former FBI Director James Comey is a conflict in his ability to lead the investigation.

Trump's legal team has left open the possibility Trump will fire Mueller as well.

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Rubio said he does not think Trump will fire Mueller as the special counsel leading the Russia investigation.

"I don’t believe that’s going to happen,” Rubio said.

The White House also said Trump has “no intention” of dismissing Mueller, despite recent reports that the president is weighing firing him.

Rubio’s comments come after Trump on Twitter last week slammed the Russia investigation, calling it a “witch hunt.”

“You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people! #MAGA,” Trump tweeted last Thursday.