To be fair

Don't lose sight of the important story--not that Trump would assert dictatorial powers (of course he would), but that none of the appointed lawyers in the executive resign, and that *no* elected GOP officials rebuke him, let alone take more serious steps to stop him.

— Marty Lederman (@marty_lederman) April 14, 2020

Lynne Cheney did:

The federal government does not have absolute power.

“The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.” United States Constitution, Amendment X

— Liz Cheney (@Liz_Cheney) April 13, 2020

And B)  nobody is in D.C. right now, thanks to the pandemic.

Sure, Senators could go on FoxNews or MSNBC or CNN and "push back" against what Trump said yesterday, but honestly, what would that do?  Trump is shooting his mouth off.  The fact is, he doesn't have the authority to "re-open" the country or to tells governors what to do, especially when it comes to public health and safety.  The President might be able to nationalize the National Guard, but the POTUS can't tell the governors how to respond to a public health crisis, and that weakness/strength cuts both ways.

Ron DeSantis in Florida endangered the entire country by not closing the beaches for Spring Break.  Trump couldn't do anything about that (not that he wanted to), but neither could Cuomo or Abbott or Gov. Edwards of Louisiana.  While perhaps the power of pandemic control needs to be nationalized, it isn't.  Period.  And while Trump can rant and rave all he wants, he's like Lear in the hurricane, or Canute at the seashore (except Canute knew what his worshippers/followers didn't):  he's absolutely powerless, and his rants about his power prove that.  Trump can't send the National Guard to take over the government of New York state, and he can't arrest Andrew Cuomo and replace him with Jared Kushner.  Trump literally can't do anything.

And the GOP officials who refuse to rebuke him, or worse yet who go along with him, will have to face the voters soon enough.

And C)  no, Trump would not 'of course' assert dictatorial powers.  That would make Trump responsible for what happened and besides, asserting them and having them followed are two different things.  Trump may claim he has authority over the nation's governors; when they don't recognize that authority, what does he do next?