This scene is in Revenge of the Sith. Palpatine says "I am the Senate!"
I am The Sanate
The Horned King says "I am the Senate!"
I am The Sanate
Megatron says "I am the Senate!"
I am The Sanate
Zygon says "I am the Senate!"
I am The Sanate
Baron Greenback says "I am the Senate!"
I am The Sanate
Sykes says "I am the Senate!"
I am The Sanate
Sa'Luk says "I am the Senate!"
I am The Sanate
Steele says "I am the Senate!"
I am The Sanate
Lord Shen says "I am the Senate!"
I am The Sanate
McLeach says "I am the Senate!"