‘Donald Trump is losing his marbles,’ former Congressman and Republican Adam Kinzinger said

Republicans are concerned that party leader Donald Trump is having a “public nervous breakdown” after he made a series of offensive outbursts about Vice President Kamala Harris as he slips behind her in the polls.

The former president has made a number of  insulting personal attacks against his Democratic rival since she moved to the top of the ticket. Last week, Trump questioned Harris’s racial identity  at the National Association of Black Journalists conference. Over the weekend, he accused Harris of having a “low IQ.”

New polls indicate Trump is slipping behind the vice president in the popular vote and races are tightening in battleground states.

“This is what you would call a public nervous breakdown,” Matthew Bartlett, a Republican strategist and former Trump state department appointee, told Politico.