Howard Stern announced Monday he's "all in on Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE," saying President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE "could have been ahead of this curve" on the coronavirus pandemic.

Stern made his endorsement on his SiriusXM radio show after a Trump supporter defended the president's Thursday remarks regarding using disinfectant or ultraviolet light to combat the coronavirus, which Trump tried to walk back on Friday as being "sarcastic."

"What's it going to take? I don't get it," Stern said of the president's comments. "I don't think there is anyone left who will vote for him."

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"I am all in on Joe Biden," he later added. "You see the wall that's right next to you, I'll vote for the wall over a guy who tells me that I should pour Clorox into my mouth. Listen, I think we are in deep shit. I think we could have been ahead of this curve."

Stern suggested a massive rally for Trump supporters where they can ingest disinfectant and "all drop dead."

Stern, who regularly interviewed Trump before he jumped into politics and enjoyed a friendly relationship with the former real estate mogul and reality TV star, endorsed former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE in 2016.

Stern has repeatedly hit Trump over his response to COVID-19, including late last month for bragging about the TV ratings of his White House coronavirus press briefings.

Biden, whose campaign has been largely sidelined due to the pandemic but who has been doing interviews from his home in Wilmington, Del., has not been interviewed by Stern. The former vice president has done several late-night interviews in recent weeks, including with NBC's Jimmy Fallon, CBS's James Corden and ABC's Jimmy Kimmel James (Jimmy) Christian KimmelKimmel-hosted Emmy Awards attract all-time low 6.1M viewers: 'Well, we set a record' Bubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

Stern conducted a 2½ hour interview with Clinton in December.