This has been posted here repeatedly but is false. The President doesn’t have the authority to shut down anything outside U.S. government jurisdiction. The CDC can’t impose restrictions like that. It can only issue guidelines.
In fact, some of the most restrictive lockdowns were imposed in March/April 2020 in a group of northeastern states after their governors complained that they weren’t getting any direction from the Trump administration.
And yet, they did.
He didn’t impose it, you claim, yet:
https://foreignpolicy.com/2020/03/30/morning-brief-trump-extends-coronavirus-lockdown-april-30/