Donald Trump launched a stinging attack on Joe Biden calling into question his intelligence.
The President also branded polls showing him trailing his Democrat opponent as “fake” in an interview with Fox News.
“Biden can’t put two sentences together,” Trump said when he was told about a new Fox News poll showing the former vice president beating Trump in November.
“They wheel him out. He goes up – he repeats – they ask him questions. He reads a teleprompter and then he goes back into his basement.”
Trump is under pressure in the US as coronavirus cases continue to soar, with Florida and Texas now being badly hit, and more than 140,000 dead nationwide.
But he still is confident of victory in November.
“First of all, I’m not losing, because those are fake polls,” Mr Trump said in the recorded interview, which was broadcast on Sunday.
“They were fake in 2016 and now they’re even more fake. The polls were much worse in 2016.”
The president went on to describe the nation’s top infectious diseases expert, Dr Anthony Fauci, as “a little bit of an alarmist” about the coronavirus pandemic and stuck to what he said back in February – that the virus was “going to disappear”.
When Trump assured that Biden would be less mentally fit to serve in the White House, Fox News Sunday host Chris Wallace brought up the cognitive test the president boasted he “aced”
Trump insisted that Biden would not do as well.
“Well, I’ll tell you what, let’s take a test,” Trump said, posing a challenge to Biden. “Let’s take a test right now. Let’s go down, Joe and I will take a test. Let him take the same test that I took.”
“Let Biden sit through an interview like this, he’ll be on the ground crying for mommy,” Trump added. “He’ll say, ‘Mommy, mommy, please take me home’.”
President Trump is refusing to publicly commit to accepting the results of the upcoming White House election, recalling a similar threat he made weeks before the 2016 vote.
Speaking during an interview on Fox News Sunday, Mr Trump scoffed at polls showing him lagging behind Democrat Joe Biden.
He told interviewer Chris Wallace: “I have to see. Look … I have to see.
“No, I’m not going to just say yes. I’m not going to say no, and I didn’t last time either.”
Four years ago, in the closing stages of Mr Trump’s race against Hillary Clinton, he said he would not commit to honouring the election results if the Democrat won.
The Biden campaign responded to the president’s latest remarks, saying: “The American people will decide this election. And the United States government is perfectly capable of escorting trespassers out of the White House.”
Mr Trump has seen his presidential popularity erode over his handling of the coronavirus pandemic and in the aftermath of nationwide protests centred on racial injustice that erupted after George Floyd’s death in Minneapolis nearly two months ago.
He contends that a series of polls that show his popularity eroding and Mr Biden holding an advantage are faulty, saying he believes Republican voters are underrepresented in such surveys.