Former White House doctor Ronnie Jackson expressed concern about the state of US President Joe Biden due to the latter's lack of campaign events, FAN reports.

Former US President and candidate in the upcoming election, Donald Trump, is developing his campaign and holding events campaigning to vote for himself, as is Florida Gov. Ron DeSantis, who is another Biden rival.

But the latter has not held a single event dedicated to his election campaign this year due to his desire to run for a second term, the doctor wrote on his social networks.