Senate rules can be changed, and they often have been.

Changes to the permanent Senate rules were passed by a vote of 86 to 9.

Senate rules make it possible for one member to block legislation.

Due to Senate rules, no more than 3 flags are allowed per order.

Under Senate rules, a trial could be abandoned at any point by a majority vote.

Because the bill would add to the national deficit, at least 60 votes will be needed under Senate rules.

But that would break with precedent and require a change in Senate rules.

But Senate rules permit any senator to block a vote.

The vast majority of committee hearings are open to the public, as required under Senate rules.

Under Senate rules, such requests must be approved by both parties.