Don’t…
It really is that simple. Send a reporter to confirm it’s all lies and innuendo then spend a minute covering that fact. Something like:
“President Trump held a campaign style rally today at which he lied repeatedly about fraudulent votes and the election having been stolen from him. To be clear there is zero evidence of these claims.”
“Now we will be turning to and interview with President Elect Biden regarding his transition team and possible members of his cabinet.”
Cut to clip of Biden doing just that, or cover the weather, or cover football, or… or… or…
DO NOT GIVE THE LIAR IN CHIEF A PLATFORM!
Again… it really is that simple...