Donald Trump Jr. Attacks Biden's Fitness Amid Questions Of His Own Mental State

Donald Trump Jr. has again taken to trolling Democratic challenger Joe Biden's fitness to hold his father's office while also defending against questions about his own mental state.

Trump Jr. appeared on FOX News' "Life, Liberty & Levin" to claim that the 77-year-old Biden's health record is "pretty dismal" and question his ability to do the job of 74-year-old father.

"The difference is, we're not entrusting the average grandparents with the nuclear football, Mark," Trump Jr. told host Mark Levin. "We're not entrusting them with the greatest economy of the world. We're not entrusting them with 350 million people now."

Trump Jr. also repeated many of the allegations he made against Biden in his controversial speech at the Republican National Convention on Wednesday. His glassy-eyed demeanor and profuse sweating prompted talk-show hosts and internet innuendo to speculate that his blank stare and combative disposition were because he was on drugs.

"I guess there must have been something with the lighting," Trump Jr. told "Fox & Friends" before taking a shot at Biden's son, Hunter, who has a history of battling drug addiction. “... It was pretty ridiculous. When they can’t attack the delivery, when they can’t attack the substance, they gotta attack something.”

Trump Jr. chose to attack Biden's acceptance speech at the Democratic National Convention to drive home his point, saying the presidency requires more than just "delivering a teleprompter speech."

"That's sort of his thing. After 50 years in D.C., you should be able to do that. But then you see, his wife almost had to carry him off the stage," he said.

"You know, is this guy going to wake up at 3 in the morning to take a phone call? Is this guy going to be capable of doing that? And if we're not sure, should someone other than me be asking this question?"

Trump Jr.'s remarks follow Biden's widely praised acceptance speech at the DNC. Biden called for an America united in a firm determination to unite in love and hope.

"Let us begin you and I together one nation under God, united in our love for America, united in our love for each other," said Biden.

After Biden's speech, Fox News host Chris Wallace praised Biden's acceptance speech as an "enormously effective" address that "blew a hole" in questions about his mental health.