Baldwin was celebrated for his impersonations of former US President Donald Trump on NBC's comedy sketch show "Saturday Night Live," which drew the public ire of Trump and his eldest sons.
"With your help, we will take back the House, we will win the Senate and then a Republican president will make a triumphant return to the White House. I wonder who will that be?" he said, smiling.
Ivanka Trump is heavily criticized following a controversial tweet calling those that infiltrated the US capitol as "patriots".
Andrew Giuliani, the son of the president's personal lawyer Rudy Giuliani, also said he tested positive for COVID-19 on Friday.
Trump is setting what one official called “fires”: plunging the United States into controversies that it will be hard for Biden to exit.
The family remains divided over how to handle Trump's behavior, such as infamously driving around the hospital while still contagious, but they appear united in worrying over his tweets.
Trump Jr.'s account was suspended after he posted a viral video of doctors talking about Hydroxychloroquine.
She is "doing well, and will be retested to ensure the diagnosis is correct since she's asymptomatic, but as a precaution will cancel all upcoming events."