It's slightly possible they keep the senate but far outside the realm of reality that they keep the house.

There will be a lot of vote manipulation for sure, to tilt the scale in favor of rapeblicans. As Serbia and Hungary has shown, there's an amount of voter turnout that cannot be manipulated, unless they completely give up the appearance of democracy (that is, a coup). There's a chance for both. More chance for a coup, less chance for Americans hauling their asses to the voting booths in large enough numbers, but there's a chance.