Oklahoma Sen. James Lankford said special counsel Robert Mueller should be allowed to continue his investigation and not face interference from President Trump or congressional Republicans.

Lankford said on NBC’s “Meet The Press” Sunday that Mueller is not facing any threat from Congress or Trump at this point.

“Bob Mueller needs to be able to finish his investigation. The challenge of any investigation like this is how long it could go on and how broad it could be,” Lankford said, pointing at the special counsel investigation during the Reagan administration that went on for six years.

“We don't want to see that, but I do think Bob Mueller needs to be able to do his investigation, do it independently, stay in place, use the resources he can to get finished as quickly as he can get finished to get all the facts,” he said.

Three congressional Republicans introduced a resolution calling on Mueller to step down and Trump has criticized Mueller for indicting three of his campaign officials. Trump wants to see Mueller go after Democrats like Hillary Clinton instead.

Lankford said Congress doesn’t need to take any steps to protect Mueller from interference from the White House or Capitol Hill.

“No, I don't,” Lankford said when asked if Congress needs to codify Mueller’s role.

“The White House has said over and over again they have no desire to push him out. That shouldn't be an action of Congress as well. Let's let him finish his job.”

Lankford added he’s not worried Mueller’s progressing investigation, which new reports indicate could end up with more indictments soon, will conflict with the Senate and House intelligence committees investigation into Russian meddling in the 2016 election.

“I'm actually not concerned about that at all. We have individual lanes. We have deconfliction that happens regularly,” he said.

“They're focused on criminal investigations. We're focused on armchair quarterbacking, making sure every witness has been seen, every fact has been checked and we're going through the policy aspects, because long-term we have policy issues how we handle elections, how we handle social media, how we're handling classified information and that is getting out in the public sphere. Those are things we will look at uniquely. The special counsel has things that he will uniquely work on as well.”