WASHINGTON (JTA) — Mortimer Zuckerman says he won’t run for New York’s junior spot in the U.S. Senate.

Zuckerman, 72, was considering mounting a Republican challenge against Sen. Kirsten Killibrand (D-N.Y.), who was appointed to the seat a year ago to succeed Hillary Rodham Clinton when she was named U.S. secretary of state.

Zuckerman, a Canadian-born naturalized American and a media magnate who would have funded his own run, said business and family obligations kept him from running, The New York Times reported.

Zuckerman is a past chairman of the Conference of Presidents of Major American Jewish Organizations.