Rubio is liar. The states would have to call for the electors to be returned, and the Democrats would have to control the state legislature.
They can't do that. The Constitution states explicitly that all the electors have to be certified on the same date. In 2020, Congress established December 14th as that date.
If a state called for its electors to be "returned" after that date, it would forfeit its right to have ANY of its electors counted.