A nonprofit organization named Concerned Veterans for America has begun running an ad asking readers to call their senators and urge a vote in favor of Stephanos Bibas, a Penn Law professor who was recently nominated to fill a vacancy on the U.S. Court of Appeals for the Third Circuit.

The committee is a nonprofit 501(c)(4) organization, and is widely reported to be backed by Charles G. and David H. Koch, the politically influential conservative billionaire owners of Koch Industries.