Interested in additional information on his current investigation of the Russian interference in the U.S. Election?

There's multiple ways for you to learn more and get involved.

Learn More Now

Mattes Speaking to CA Democrats on Russian Inflitration

Sanders Supporters Targeted by Propaganda Campaign

Mattes is inquisitive, persistent and resourceful with a tough determination to probe behind the surface of things.

Wisconsin State Journal

Quite frankly, I don’t think our investigation would have proceeded without John.

Chief of Staff to Senator John Kerry