Republican Rep. Michael Grimm may have easily defeated his Democratic opponent, Mark Murphy, this past November, but he may be facing troubled times ahead.

The Staten Island congressman’s latest filing with the FEC indicates his camapign committee spent another $100,000 on legal fees with the Washington, D.C. firm Patton Boggs. This filing covers the period from Nov. 27 through Dec. 31, 2012, so that’s a pretty hefty bill.

Last month, Grimm’s committee reported it had incurred $677,966 in legal fees from Patton Boggs. And that was on top of the $321,000 debt to the firm that was reported in June.

Taking into account the latest filing, Grimm’s legal bill now tops $1 million.

Patton Boggs is representing Grimm in the ongoing FBI probe into his fundraising.

An Israeli national, Ofer Biton, is at the center of the inquiry by the US attorney’s office in Brooklyn into whether Biton and Grimm collected contributions for Grimm’s 2010 campaign that exceeded contribution limits, were given in cash or came from foreigners without green cards.

Biton was charged last August with immigration fraud.

A House ethics panel has said it voted to investigate Grimm in November, but decided to defer to the Justice Department’s ongoing investigation of the fundraising activities. Grimm has denied being engaged in any illegal activities.

Also today, the House Majority PAC announced Grimm is one of ten “extreme” Republican members of Congress on its target list for 2014. He’s the only New Yorker on the list. The others are: Michele Bachmann (MN-06), Mike Coffman (CO-06), Gary Miller (CA-31), Rodney Davis (IL-13), Mike Fitzpatrick (PA-08), Joe Heck (NV-03), David Joyce (OH-14), John Kline (MN-02) and Steve Southerland (FL-02).

“In 2012, House Majority PAC built a strong record of success and in 2013 we are ready to hit the ground running to hold these Republicans accountable and communicate with swing voters about their extreme records and backwards priorities,” said the committee’s Executive Director Alixandria Lapp.

“Whether it’s supporting the end of Medicare as we know it, backing tax cuts for the wealthy, working to roll back the clock on women’s rights or opposing stem cell research, these Republicans are simply out of step with the districts they represent. House Majority PAC will work to ensure voters know the truth.”

During the 2012 cycle, House Majority PAC spent approximately $36 million. Democratic candidates won in eight of the 10 races in which the committee spent the monst cash.

So far, two Democrats have expressed an interest in potentially challenging Grimm in 2014 – former Rep. Mike McMahon, who was ousted by Grimm in 2010; and Brooklyn Councilman Domenic Recchia, who was pushed out of the NYC comptroller’s race by Manhattan BP Scott Stringer and the Brooklyn BP race by frontrunner/Sen. Eric Adams.