Once again, Trump has utterly no power to do this. None. Zip. Zilch. A number of great sources make clear why this is not possible. Here's some of the best of them: the National Constitution Center (link here), Roll Call magazine (link here), the New York Times (link here), and the Washington Post (link here).
Why did he do this? The answer was obvious. Yesterday was a brutal news day for him. The US Gross Domestic Product in the second quarter fell by the largest percentage in American history, thanks in large part to his gross mismanagement of the Covid-19 pandemic. And, three former Presidents from both parties delivered moving eulogies to the late great John Lewis at a funeral Trump skipped.
Because he wanted to distract people and because he cannot stand it when he's not the center of attention, he tweeted his usual horseshit. Don't let him distract you.