Former President Bill Clinton is lending his support to Sen. Bob Menendez's re-election bid.

The senator's campaign announced Tuesday that Clinton would headline a fund-raiser for Menendez on June 1. But further details haven't been announced.

Menendez, a Democrat who has served in the Senate since 2006, was a member of House during Clinton's presidency in the 1990s. He's being challenged by Republican state Sen. Joe Kyrillos.

Menendez has banked $9.5 million for the race. Kyrillos has raised $1.75 million so far.

Kyrillos tapped his friend and ally, Gov. Chris Christie, to headline a fundraiser for him shortly after he declared his intent to challenge the incumbent.

Democrat Barack Obama is at the top of the November ballot, making the race tougher for Kyrillos.

(Copyright 2012 by The Associated Press.  All Rights Reserved.)