Yesterday, we reported that Barack Obama had mocked President Donald Trump while campaigning for Joe Biden in Philadelphia, Pennsylvania. Now, President Trump is firing back at him in a big way.

“Obama is campaigning for us. Every time he speaks, people come over to our side,” Trump tweeted. “He didn’t even want to endorse Sleepy Joe. Did so long after primaries were over!”

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Despite the fact that Biden was Obama’s former Vice President, he waited to endorse him until April, when it seemed certain that he would secure the nomination. During a rally in North Carolina, Trump pointed out that it “took forever” for Obama to publicly endorse Biden. Trump went on to recount a conversation he had with a staffer who said Obama campaigning for Biden could be “bad news” for his re-election campaign.

“Somebody said, ‘Sir, maybe this isn’t good. President Obama’s campaigning for sleepy Joe Biden.’ I said, ‘That’s good news or bad news? Tell me, are you saying it’s good or it’s bad?’ ‘Well, I guess it’s bad.’ No, it’s good,” Trump said. “There is nobody that campaigned harder for ‘Crooked’ Hillary Clinton than Obama. He was all over the place.”

Trump’s tweet came one day after Obama said at a rally that with the current president out of the White House, “you might be able to have a Thanksgiving dinner without an argument.”

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“You’ll be able to go about your lives knowing that the president is not going to retweet conspiracy theories about secret cabals running the world or that Navy Seals didn’t actually kill Bin Laden,” Obama added, according to Fox News. “Think about that. The president of the United States retweeted that. Imagine.”

In his first official appearance on the campaign trail for Biden, Obama claimed that Trump isn’t interested in being president and that he has treated the job like a reality show.

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“And by the way, even his TV ratings are down, so you know that upsets him,” Obama said. “The thing is this is not a reality show, this is reality and the rest of us have had to live with the consequences of him proving himself incapable of taking the job seriously.”