CBS Corp. announced Thursday that Les Moonves, who resigned as CEO in September amid allegations of sexual harassment, was challenging the company’s decision last month to deny him his $120 million severance package.

CBS said in a filing with the U.S. Securities and Exchange Commission that Moonves had informed the company Wednesday that he intended to use a binding arbitration provision in his contract to try to recover his “golden parachute” after the company determined there were grounds to fire him for cause. The development was first reported Thursday morning by The Wall Street Journal.