From NPR:

INSKEEP: Well, let’s talk this through for a moment. It seems to me that, on one level, the law is clear. Vice President Pence, who was presiding over the joint session of Congress, looked into this. Constitutional scholars looked into this. It obviously was simply a lie that Congress had the authority to somehow overturn the will of the people and change the results of the election. Why would you need to clarify the law when it already was clear to the scholars who looked at it at the time?

WAMP: Well, there were certain members of the United States Senate who used the terms regularly given to say that there were election disputes in states like Wisconsin, and therefore it wasn’t regularly given. Because that’s the original statute, which is – again, that’s language from 135 years ago. Regularly given then meant that maybe somebody in the Electoral College was held at gunpoint or they were bribed. We actually have to clarify the law to say that unless the Electoral College somewhere in this country was actually disrupted by something like that – like somebody was held at gunpoint before they submitted their results – then all the role is for the Congress is to count the votes.