The National Republican Congressional Committee is spending heavily in the race to succeed Democratic Rep. Steve Israel, booking $1.1 million in cable TV advertising on behalf of GOP candidate Jack Martins.

The race for the third congressional district, which includes parts of Queens and Nassau County, is among the most closely watched and likely to be hotly contested races this fall in New York, if not nationally.

Martins, a state senator elected in 2010, is facing Democratic former Nassau County Executive Tom Suozzi.

The amount of money being invested this early by the NRCC in the swing district, while eyebrow raising, is a sign Republicans hope the district will be a competitive one for them this November.

It’s also among the few seats this fall Democrats have to defend in New York House races.

Democrats are eyeing the eastern Long Island seat held by freshman GOP Rep. Lee Zeldin and the Hudson Valley’s 19th district being vacated by Rep. Chris Gibson.