Here's is what could happen. If Trumpelthinskin thinks the GOP can't protect him anymore if they lose the majority in midterms.
He declares massive voting fraud, calls supporters to attack immediately. GOP refuses to accept results. FBI seizes ballots and voting machines within days.
Results stall for weeks.
Republican officials cancel results in lost districts, order new votes. Protests erupt. Troops deploy under the Insurrection Act. January 3, Congress refuses to seat the Democrats.
This isn't prediction. It's pattern. They've already done each of these things.
Remember to all the people supporting treason for this political cult , in the Nuremberg trials " I was just taking orders " was not an adequate defense for crimes against humanity.