Dennis Rodman apparently once told Kim Jong Un to his face that the North Korean leader's "father and grandfather did a lot of f---ed up shit” in their time.

The NBA Hall of Famer, who's traveled to North Korea and met with Kim multiple times, opened up about his relationship with the dictator during a Monday appearance on SiriusXM's "Howard Stern Show,” exactly one week after President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s historic summit with Kim.

"Dennis stands up, he's got his glass," said Christopher Volo, Rodman's spokesman, who joined the basketball star on at least one of the North Korea trips.

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"Your father and grandfather did a lot of f---ed up shit," Volo said Rodman exclaimed as he addressed Kim during a toast.

"[Rodman] pauses, and he goes, 'But you're trying to change things — and that's a great, great thing."

"I'm like, 'Oh my God, what's going to happen?'" said Volo.

"Kim Jong Un gets up, starts clapping. That's when I knew we could do no wrong," Volo said with a laugh.

Rodman, 57, traveled to Singapore last week ahead of the Trump-Kim summit.

While sporting a pro-Trump "Make America Great Again" hat, Rodman revealed during an emotional CNN interview last week that White House press secretary Sarah Huckabee Sanders had called to thank him for his efforts in communicating with North Korean officials.

But on Monday, Rodman said he wasn't aware of who Huckabee Sanders was when she phoned him.

"To be honest with you, I didn't even know who she was," Rodman laughed. Rodman said a friend informed him of the chief Trump spokesman’s position at the White House.

"It was cool that she called," Rodman said, "and expressed the fact that [Trump] was happy that [I] supported him."