Well it seems to me that they did claim to know everything about it. It, and everything else, including climate change.
Biden promised to follow the facts, listen to the science and scientists, and provide leadership.
in January 2020 Trump listened and learned BUT LIED to the American people about covid.
His lack of leadership has resulted in over 10 million Americans getting infected and close to 250,000 dead.
He did not provide leadership he hid from it.
And the coward is hiding from it now.
He is emotionally sick and damaged.
What does Trump know now that he's keeping from Biden and us?
Only a fool would trust Trump's judgement or a traitor to this country.