And he said the billions in bullion better be there when he opens the doors. 

'All my life, I've heard about Fort Knox. That's where the gold is kept, right?,' he told the Republican Governors Association on Thursday night. 

'We're going to open up the doors. I'm going to see we have gold there. We want to find out, did anybody steal the gold in Fort Knox?'

He also vowed: 'I'm going to actually go. We're going to open the doors We're going to inspect Fort Knox. We want to make sure that we actually have, you know, 400, tons of gold, or whatever to hell it is. It's a lot of gold. I don't want to open it and the cupboards are bare.'

Elon Musk, who Trump tasked with weeding out wasteful government spending and inefficiency, urged officials to audit how much gold is at the Fort Knox military base in Kentucky.

The SpaceX founder also brought up a decades-old conspiracy theory that the U.S. gold reserves are no longer there. 

Musk was asked on X about viewing the facility and responded: 'Surely it's reviewed at least every year?'

But Republican Senator Rand Paul of Kentucky said it's not and personally invited Musk to come view it.

Additionally, Musk posted a meme Monday from the animated comedy 'South Park' that reads 'Annnnd It's Gone' with the caption, 'Looking for the gold at Fort Knox …' 

Trump indicated Thursday night he wants to come on the trip, which has not been scheduled. 

He told reporters on Wednesday that he wanted Musk to look into the issue. But he had no answer when a reporter asked him where the gold may have gone.

'If the gold isn't there, we're going to be very upset,' the president replied.

Fort Knox holds roughly 147 million troy ounces of bulk gold, which represents over half the gold held by the U.S. federal government or 56.35 percent of the total.