Obama appeared in Philadelphia, labelling Trump as 'crazy,' and accusing the President of lying every day, and tweeting conspiracy theories "about secret cabals running the world, or navy seals didn't actually kill Bin Laden".

Obama also attacked Trump on the coronavirus response, stating "We literally left this White House a pandemic playbook," adding "They probably used it to, I don't know, prop up a wobbly table somewhere."

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Trump hit back at Obama during a rally in North Carolina, telling the huge crowd "You know Obama's now campaigning. Oh, here we go."

Referring to him as 'Barack Hussein Obama,' Trump said his predecessor had "refused to support Biden," up til now.