"[Biden] refuses to answer questions from the American people or journalists, he's been hiding in a basement but now he's gonna also change things," the executive vice president of The Trump Organization said. "I really don't think anyone believes that."
"If he can read a speech on a teleprompter, you would think he would be able to get in front of the American people, you would think he would be able to do an interview with a real journalist where they're not giving him prescripted answers," Trump said. "But he can't."
Trump added that Biden "hasn't done anything to deserve inspiration through a very long and swampy career."
The president's son took a swipe at the former vice president's son Hunter Biden, whom he has offered to debate.
"He didn't talk much about Hunter strangely enough," he said. "Hunter Biden took $1.5 billion from the Chinese government. To the average person in a fund, just so you're aware, that's $30 million a year in fees ... annual. You think Joe's going to get tough on China now?"
He said Biden was involved in all the deals the president has had to fix.