Trump tweeted: "The Vice President has the power to reject fraudulently chosen electors.", but according to the U.S. Constitution, the VP simply presides over the session. Have no clue what Pence will do; let's hope he doesn't embarrass himself and further embarrass the country.

The die-hard Trump Kool-Aid drinking Senators could force a roll call vote, but at best would only find out which Republican Senators were for or against overturning the election. Unless something drastically changes, they won't even get a majority of the Republicans and less than the necessary 51 votes. But let's say in the MAGA fantasy world the Senate does get 51 Senators to vote to reject some or all the official state electoral results, they still need a majority in the House. 

At the end of the day, the weirdo Senators and House Reps will waste about 3 hours to learn the Presidential election results are exactly the same as they were after the Electoral College voted.