President Donald Trump assailed likely opponent Joe Biden as "not competent" to lead the country, speaking as polls over the weekend showed deepening voter disenchantment with his own handling of the coronavirus pandemic.
"He's shot, he's mentally shot," Trump said about Biden in a wide-ranging interview with "Fox News Sunday."
He said that if Biden is elected on November 3, he would "destroy this country."
Trump made several unfounded or highly speculative accusations against the former vice president, saying he would "triple your taxes" and "defund the police."
He added, "Religion will be gone," referring to Democratic officials banning large church services to stem the virus spread.
The interview, which was taped in advance, came as new polling results showed support for Biden surging as doubts about Trump's handling of the pandemic grow amid a resurgence in many states.
Interviewer Chris Wallace told the president that a new Fox opinion poll showed Biden with a substantial lead over Trump not only on his ability to manage the pandemic and deal with racial unrest, but even -- by a single point -- on handling the economy, long a Trump strong point.
And a new Washington Post-ABC News poll has Biden leading Trump among registered voters nationwide by a resounding 15-point margin, 55-to-40 percent.
Trump dismissed such polling as "fake," saying White House surveys show him winning both nationally and in key swing states.
Trump claimed that the Democrat wanted to "defund the police" -- a battle cry of some anti-racist protesters -- and insisted that such language was in a Biden policy document, though he was unable to produce it when challenged by Wallace.
As he repeatedly questioned his rival's mental acuity, Wallace asked him directly if thought Biden was senile.
"I don't want to say that," Trump replied. "I say he's not competent to be president."
He questioned whether the Democrat could pass a cognitive ability test that he said he had "aced," and said the former vice president would fall apart under tough questioning.
"Let Biden sit through an interview like this, he'll be on the ground crying for Mommy. He'll say, 'Mommy, Mommy, please take me home.'"
Trump again defended his handling of the pandemic, claiming that "we are the envy of the world" on testing; and, of his early prediction that the virus would someday disappear, said, "I'll be right eventually."
He again opposed any national mandate for mask-wearing, saying, "I want people to have a certain freedom."
Trump said the economy was "doing very well," even as millions remain jobless.
And asked whether he would accept the election result in November, even if he loses, he repeated his position of 2016, saying, "I have to see ... I'm not going to just say yes."