This week marked the so-called safe harbor deadline when states have certified their results for the U.S. presidential election. Typically, by the safe harbor deadline, election-related challenges at the state level are wrapped up. 

But, President Trump is continuing to claim - without proof - that the results in many of the states that voted for Joe Biden are fraudulent and should be tossed out. So, how can the election be both certified - and contested?

Helping us to make sense of it all is our friend Barbara Perry, the Presidential Studies Director at the University of Virginia’s Miller Center. She begins by explaining who the electors are and what the Electoral College actually does.