​President Trump marked Joe Biden’s entry in the 2020 presidential race by referring to him as “Sleepy Joe” and insulting the former vice president’s smarts.

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

“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 said about the ​20-strong ​field of ​Democratic presidential candidates.

Biden, 76, kicked off his campaign with the release of a video on Thursday that tore into Trump, saying “we are in the battle for the soul of this nation.”

“If we give Donald Trump eight years in the White House, he will forever and fundamentally alter the character of this nation​. Who we are,” Biden said. “And I cannot stand by and watch that happen.”

Trump began referring to the former veep as “Sleepy Joe” last week in a tweet when he predicted who would prevail ​in the Democratic primary to eventually face him​.

​​”​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 said.​​

​The president previously referred to Biden as “crazy Joe.”​