EXCLUSIVE: Trump accuses Biden of lying about Obama's lack of endorsement

President TrumpDonald John TrumpCuomo grilled by brother about running for president: 'No. no' Maxine Waters unleashes over Trump COVID-19 response: 'Stop congratulating yourself! You're a failure' Meadows resigns from Congress, heads to White House MORE on Monday accused former Vice President Joe BidenJoe BidenCuomo grilled by brother about running for president: 'No. no' Top Democratic super PACs team up to boost Biden The Hill's Campaign Report: Trump, Biden spar over coronavirus response MORE of lying about his lack of a 2020 endorsement from former President Obama in an exclusive on-camera interview with Hill.TV.

"How he doesn’t get President Obama to endorse him — there has to be some reason why he’s not endorsing him," Trump said outside the Oval Office. "He was the vice president. They seem to have gotten along. And how President Obama's not endorsing him is rather a big secret," Trump mused, adding, "Then he goes and lies and said, 'I asked the president not to endorse me.' Give me a break."

Trump argued Biden made the assertion because "he’s embarrassed by the fact that Obama’s not endorsing him, so he goes out and says, 'I asked President Obama not to endorse me.' ... So it could be that President Obama knows something, but there is something going on in that brain of his."

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Pressed on what exactly is going on in Biden’s brain, Trump said, "I think he’s off. He’s different. We’ve all known him a long time. I’ve seen him for a long time. Frankly, he looks different, he sounds different, and he thinks different. Other than that, I hope he does very well."

Trump in a recent interview with "Fox & Friends" declined to endorse his own vice president, Mike PenceMichael (Mike) Richard PenceShortage of medical gear sparks bidding war among states New York Times defends reporter after Trump swipe: Her 'reporting has stood the test of time' Trump approves disaster declaration for Michigan despite sparring with state's governor MORE, ahead of a possible run for president in 2024. Asked about his comments by NBC News's Chuck ToddCharles (Chuck) David ToddBiden on quarantine timelines: 'Worst thing you can do is raise expectations and then watch them get dashed' White House coronavirus coordinator: All governors and mayors need to 'prepare like New York is preparing now' Michigan governor says states bidding against each other for medical supplies is 'creating a lot more problems for us all' MORE, Trump said he didn't answer because it was a "surprise question."

"I mean it's so far out. That would be the only reason. Now what happens in 2024 I don't know that Mike is going to run. I don't know who's running or anything else," the president said.