TRENTON - Gov. Chris Christie's office is expected to respond to a lawsuit that seeks to push back a special U.S. Senate election to the same day as the gubernatorial election.

Christie has until 2 p.m. Tuesday to file a response to the lawsuit filed last week by Somerset County Democratic Chairwoman Peg Schaffer. It seeks to move the date of the special election.

After U.S. Sen. Frank Lautenberg died last week, Christie scheduled an election to replace him for Oct. 16. That's 20 days before the main general election.

Democrats say it's wasteful to have two elections so close together.

Christie says he wanted to give voters the earliest possible say on their Senate representation.

Jeffrey Chiesa was sworn in Monday as New Jersey's newest U.S. senator. Christie appointed his state attorney general to the seat last week.