The super PAC funded by Long Island billionaire Robert Mercer is spending more money in the race for Westchester County executive, a filing at the state Board of Elections on Friday shows.

The PAC, Win For New York, is spending an additional $25,090 on media placement in the race. The PAC is backing Republican incumbent Rob Astorino, who is locked in a heated contest with Democratic challenger George Latimer.

Mercer, who announced this week he was stepping away from his investment firm and handing his share of the right-win website Breitbart News to his daughters, initially funded the PAC with a $1 million contribution.

The added media spending comes as the state Democratic Committee has began airing an ad in the suburban county linking Astorino to Mercer and President Donald Trump.