President Trump refuses to pledge not to shut down special counsel Robert Mueller's investigation.

The commander in chief did, however, say he has no plans to end the probe he has routinely derided as a "witch hunt."

"Will you pledge -- pledge that you will not shut down the Mueller investigation?" asked CBS News' Lesley Stahl during a "60 Minutes" interview which aired in full Sunday evening

"Well, I-- I don't pledge anything. But I will tell you, I have no intention of doing that. I think it’s a very unfair investigation because there was no collusion of any kind," Trump said.

"But you won't pledge --" Stahl began.

"There is no collusion. I don't want to pledge. Why should I pledge to you? If I pledge, I'll pledge. I don't have to pledge to you. But I have --," Trump replied.

"Well --" Stahl snuck in.

"I have no intention of doing that," Trump repeated.

[Also read: Trump’s legal team composing written answers to Mueller questions]

Mueller, a former FBI director, took over the Russia inquiry in May 2017 after Trump fired FBI Director James Comey. Federal investigators are looking at Russian interference in the 2016 election, potential collusion between the Trump campaign and the Kremlin, and possible obstruction by the president when he axed Comey.