US President Donald Trump on Thursday mocked Joe Biden after the former vice president launched his campaign for the Democratic presidential nomination in 2020.

“Welcome to the race, Sleepy Joe. I only hope you have the intelligence, long in doubt, to wage a successful primary campaign.

It will be nasty – you will be dealing with people who truly have some very sick & demented ideas. But if you make it, I will see you at the Starting Gate!”, he tweeted.

Biden, who was former President Barack Obama’s deputy, made his presidential bid announcement in a video in which he criticized Trump.

He is considered as Trump’s strongest challenger, although Sen. Bernie Sanders is also a big favourite for the ticket.

Last week, Trump, apparently reacting to projection, predicted that the duo could be the two finalists of their party.

“I believe it will be Crazy Bernie Sanders vs. Sleepy Joe Biden as the two finalists to run against maybe the best Economy in the history of our Country (and MANY other great things)! I look forward to facing whoever it may be. May God Rest Their Soul!”, Trump tweeted.