The 68-year-old actor has confirmed he will be voting for Donald Trump to return to the White House in the upcoming US election and his out at his Democrat rival, insisting it wouldn't be "good" if she was to triumph as she has a "miserable track record".
Asked who he will vote for at the election, the 'Braveheart' star told TMZ: "Oh man that's a big question., I don't think it's going to surprise anyone who I vote for."
Asked if he means Trump, he replied: "I think that's a pretty good guess."
The 'Passion of the Christ' actor was then pressed on what he thinks the country would be like if the former 'Apprentice' star returned for a second term, but he failed to answer the question as he opted to attack Kamala instead.
He said: "I know what it would be like if we let her and that ain't good. Miserable track record, a falling track record, no policy to speak of. She's got the IQ of a fence post."
The 'Mad Max' star's comments echo Trump's own remarks about his rival.
He recently told CBS that the vice president had given "an answer that was from a loony bin".
And at a rally in Georgia earlier this week, he declared: "She's not a smart person. She's a low IQ individual."
Mel's remarks come less than a week after he was defended by Andrew Garfield.
The 41-year-old actor said he had learned when starring in 2016's 'Hacksaw Ridge' - which was directed by Mel - that people "deserve second chances, third chances, fourth chances".
He added to People magazine: "That none of us are infallible."
The 'We Live In Time' actor said he had had "deep, important conversations" with his director - whose career fell into decline in 2006 after he made anti-semitic remarks when being arrested for DUI - and praised him for working on himself.
He said: "He's done a lot of beautiful healing with himself...he's an amazing filmmaker, and I think he deserves to make films. He deserves to tell stories because he has a very, very big, compassionate heart."