Watched barnes law, he said something about the deadline is actually Jan 6th not dec 14th but it wasnt clear if he was referring to the legal challenges or something to do with sending our electors
Ill try to find it again but I'll post this in the meanwhile
The 14th is when the Electors vote on the President. The 6th is when the legislative branch certifies the results, I believe.
Actually the election can be overturned at any time in the future when fraud is proven.