Can the senate change the rules at this point regarding impeachment ?

[Baked Potato]

11. I believe it takes a supermajority to change a rule, 51 votes to override a Chief Justice ruling

“In other words, a huge amount in any Senate trial depends on two big variables: the attitudes and views of Chief Justice Roberts and, ultimately, which side controls 51 votes to either sustain or overrule his rulings or to rule on questions he declines to address. An important wrinkle here is that it takes 67 votes, not 51 votes, to change a rule—so one key question is whether a motion would require a waiver of an existing rule or whether it can reasonably be reconciled with the rules. If it requires a rule to be waived or dispensed with, the motion requires a supermajority.”

From:

Imagining a Senate Trial: Reading the Senate Rules of Impeachment Litigation

By Hilary Hurd, Benjamin Wittes Monday, December 2, 2019, 3:35 PM

https://www.lawfareblog.com/imagining-senate-trial-reading-senate-rules-impeachment-litigation