Donald Trump
The Republican presidential nominee gave thousands of dollars to the likely Democratic presidential nominee when she ran for California attorney general.
The former president pushed conspiracy theories about Biden after his historic announcement.
"Crooked Joe Biden was not fit to run for President, and is certainly not fit to serve," Trump wrote in a social media screed.
The announcement will upend the Democratic Party's nomination contest as leaders seek a powerful new challenger to Donald Trump.
James Murray was the deputy mayor of London when his boss, Sadiq Khan, permitted a baby blimp of Trump to fly over the city.
The Meta CEO hasn't endorsed either Trump or President Joe Biden's bids for a second term.
The former US president delivered a 92-minute address, dispelling the myth that he was a changed man following his assassination attempt.
Asked why he was not with his Clacton constituents instead, the Reform Party leader said: "What's it got to do with you?"
It comes after the Republican presidential nominee vowed to end Russia's war in Ukraine if elected.
Some of the former president's biggest supporters started to nod off during his rambling 92-minute speech at the RNC on Thursday.