This idea, floated by MAGA kookoobirds earlier this year and originally dismissed by the Turd, is to declare a national emergency spanning the voting and ballot verifying period. The plan would be to cancel all votes that aren't cast in person and those where the voter didn't have to show ID. The "emergency" would also supposedly allow Trump to seize voting machines and even ballots. The stated pretext would be potential Chinese election interference and/or some nonsense about BILLYUNS OF FEELTHY ILLEGULS voting.
The kookoobirds have stated that the "emergency" would only be declared in blue and swing states. The goal would be to destroy the voting process altogether in those elections and empower the state legislatures or governors to appoint House and Senate representatives. Thus, the plan is to concentrate on those states that have Republican legislatures or governors but may vote Democrat overall--or to concentrate on blue districts within red states.
This would be accomplished by executive order, which would be totally illegal and unconstitutional but would need court challenges to stop it. In the meantime, election results could be delayed for months, or even nullified altogether.
This plot had remained on the MAGA fringe until recently, when the Republicans have seen Democrats win virtually every state-level election and polls suggest that formerly safe House and Senate seats may be in danger. The plan was re-suggested to Trump, and this time, he enthusiastically approved.
I'm not going to post a link, because that alone would prove nothing. Rather, I encourage you to do a Google search on "Republican conspiracy to declare national emergency during midterms" and see what comes up.
Students of history know that interfering with free elections is Step One in the fascist playbook. Hitler did it. Lenin did it. Orban did it. And now Trump will, too.