Over the weekend, the Trump campaign released a new ad praising his handling of the pandemic crisis, which included a short clip of leading infectious disease expert Dr. Anthony Fauci saying, "I can't imagine. anybody doing more".
He faces Democrat Joe Biden in the election on 3 November.
His clip carries the words: "I have been devoting nearly full time on this".
"I have a reputation, as you probably have figured out, of speaking the truth at all times and not sugar-coating things", Fauci told the Financial Times in July, explaining why his media appearances had been curtailed and saying he had not spoken with the president in two months.
Fauci did not respond to Fox News' request for comment.
The Trump campaign defended the advert.
The Trump campaign has refused to remove the ad, and the president pushed back further on Tuesday morning.
Dr. Anthony Fauci said Monday he plans to stay in his post during the next president's term - no matter who the president is.
How have Fauci and Trump clashed before?
He made that comment, however, about the White House coronavirus task force - of which he is a member - and not specifically Trump. "That's a bad place to be when you're going into the cooler weather of the fall and the colder weather of the winter", Fauci told CNBC.
On Friday, Fauci called the White House ceremony announcing Judge Amy Coney Barrett's nomination to the Supreme Court a "superspreader event". At least 11 people who attended later tested positive for the virus.
He noted that many states are now seeing increases in positive testing.
"How dare you try to use him now as your political pawn", Troye said in apparent reference to the President's campaign effort to "flip the switch" and use Fauci's statements to advance a political agenda that has historically sought to undermine the expert. "We have done a "phenomenal" job, according to certain governors".
The ad discusses Trump's effort to recover from COVID-19, as well as his administration's work to address the coronavirus pandemic.
On Monday afternoon, the physician to the president, Sean Conley, said Trump had tested negative for the virus "on consecutive days". "Since campaign ads are about getting votes, their harassment of me might have the opposite effect of turning some voters off".
These are key swing states. "No problem, no masks" World Health Organization no longer likes Lockdowns - just came out against it. Trump was right.
Another factor this year is postal voting.
The USA has had over 214,000 deaths from Covid-19 - the highest in the world.
It has been focusing a lot on Covid.
On Sunday, Trump sounded unperturbed by the health official's protests about the ad. "And everything we've been through in the months since has proven that to be true".
The White House memo followed Trump's first public appearance since returning to the White House after being treated for coronavirus at a military hospital.
Mr Biden heads to OH on Monday, with events in Toledo and Cincinnati.
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