(CNN) President Donald Trump said "it's going to be up to him" when asked if he would accept any move by acting Attorney General Matthew Whitaker to curtail special counsel Robert Mueller's investigation.

When Fox News' Chris Wallace asked Trump in an interview that aired on "Fox News Sunday" if the President would accept Whitaker limiting the Mueller investigation, Trump replied that he was confident Whitaker would "do what's right."

"I think he's astute politically. He's a very smart person, a very respected person," Trump said. "He's going to do what's right. I really believe he's going to do what's right."

Pressed to elaborate, Trump said, "I would not get involved. And all these people that say I'm going to end the investigation, you know, they've been saying that now for -- how long has this witch hunt gone on? It's gone on for, what? ... From the day I announced."

Trump also said that he was not aware before appointing Whitaker that he had been critical of Mueller's investigation.

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