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

President TrumpDonald John TrumpRussian sanctions will boomerang States, cities rethink tax incentives after Amazon HQ2 backlash A Presidents Day perspective on the nature of a free press MORE on Monday accused former Vice President Joe BidenJoe BidenJoe Biden lost his fastball — can he get it back before South Carolina? Where the 2020 Democrats stand on taxes Bloomberg hits Sanders supporters in new ad 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 PenceShort defends Trump's tweets as a 'very effective way' to communicate with Americans Trump's 'two steps forward, one step backward' strategy with China The state of the Democratic primary: Heading to a brokered convention?   MORE, ahead of a possible run for president in 2024. Asked about his comments by NBC News's Chuck ToddCharles (Chuck) David ToddCandidates make electability arguments, talk Bloomberg as focus turns to more diverse states Biden says he has to do 'really well' in South Carolina Biden urges Sanders to take accountability for supporters' threats on culinary union 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.