Michigan Sen.-elect Abdul El-Sayed said Sunday that Democrats will work with Donald Trump to help the American people if "he wants to act serious," but if the president instead chooses "foolishness," the incoming senator said he will not find a willing partner in Congress.

"Let's talk about how he is an unserious fool. Think about this war in Iran that every single president had resisted fighting because, of course, it was a dumb idea," El-Sayed told ABC "This Week" in an exclusive interview. "Let's talk about the foolishness of a tariff war with Canada. ... Let's talk about the foolishness of gutting Medicaid to pass tax cuts for the richest people in America."

"So look, if he wants to act serious, we are happy to work alongside him to actually address these issues," El-Sayed continued. "He is the president of the United States. But if he wants to continue to fool, he will hire people like Stephen Miller to run the White House, and he gets to choose where he goes next."