Some additional information arose during the Senate impeachment trial for Donald Trump that had many senators changing their minds on allowing witnesses:

On that news, several Republicans joined Democrats in calling for witnesses:

GOP Sen. Lindsey Graham changed his vote to “yes” at the last second:

George Washington University law professor Jonathan Turley had this to say about it all:

How long will having witnesses extend the trial? A week — a month — it’s anybody’s guess.

UPDATE:

Yes, we’re confused too. Apparently now there will be no witness testimony: