Mace Windu: In the name of the Galactic Senate of the Republic… you’re under arrest, Chancellor.
Palpatine: Are you threatening me, Master Jedi?
Mace Windu: The senate will decide your fate.
Palpatine: I am the senate.
Mace Windu: Not yet.
Palpatine: It’s treason then.
From Star Wars: Episode III – Revenge of the Sith (2005)