No, but he will be joining the cast of Red, according to THR.com.  Pic tells the tale of a former black ops agent (Bruce Willis), now in retirement, who has to contend with younger, more high-tech assassins who show up to kill him.  McMahon would play a Vice President with a dark side who is at the center of a shadow conspiracy.  McMahon will be added to the growing all-star cast of Willis, Helen Mirren, Morgan Freeman, John C. Reilly and Mary Louise Parker, as well Richard Dreyfuss, Brian Cox and 92-year-old Ernest Borgnine, who are all also in talks. 

The project is based off of the Wildstorm/DC Comics miniseries and is being directed by Robert Schwentke (The Time Traveler's Wife).  Borgnine will play the keeper of the CIA’s darkest records, while Dreyfuss will be a wealthy man who builds a fortune out of lucrative government contracts. Cox is a former Cold War spy and nemesis of Willis.  Lorenzo Di Bonaventura and Mark Vahradian are producing, while Jon and Erich Hoeber wrote the script. Filming starts early next year.