After being turned down by former Rep. Vito Fossella, the Staten Island GOP is poised to pick a new candidate to challenge Democratic Rep. Mike McMahon in NY-13 this fall:Michael Allegretti.

NY1′s Shushannah Walshe reports members of the party’s executive committee met this evening and tapped Allegretti ahead of the full nominating convention, which is about to get underway.

It’s pretty much a foregone conclusion that Allegretti will get the nod of the full committee over his GOP primary opponent, Michael Grimm, who released a letter earlier today saying he wouldn’t be taking part in tonight’s convention.

(The DN’s Celeste Katz interpreted this as a “pre-emptive strike” that all-but signaled Grimm wouldn’t be getting the nod even if he sought it, and I concur with that assessment).

Grimm has the support of the Kings County Conservative Party, and is also supported by state Conservative Party Chairman Mike Long.

The SI GOP executive committee raised eyebrows when it endorsed Fossella earlier this month.

The former congressman, who decided not to seek re-election in 2008 following a drunk-driving/out-of-wedlock child scandal, had reportedly been mulling a comeback bid for some time, but ultimately decided against it.

Fossella said he took a pass on the race because he’s in a “good place” in his life, with a lucrative private sector job and some on-air commentary gigs from time to time.

But friends like Rep. Peter King said the decision was motivated largely by a desire to shield his family from a public re-hashing of the scandal that forced him to give up his seat in the first place.

UPDATE: Walshe adds:

Not a surprise, but he has been officially nominated.

It wasn’t without some fireworks. SIGOP head John Friscia read from Grimm’s earlier letter and asked the committee how they felt about being called corrupt.

He said Grimm denied the committee the chance to nominate him and asked them rhetorically how that felt.

A member of the committee, Louis Adimano, spoke after to nominate Grimm and said: “Michael Grimm’s letter was not a slap in the face to the committee, but to you.” (Meaning John Friscia).

He added that the exec committee’s earlier nomination of Fossella was “an embarassment” and that “the Golden boy has fallen.” He was quickly shouted down, and Allegretti was then nominated.

Also, McMahon release the following statement:

“Tonight, I believe that come November, the people of Staten Island and Brooklyn will choose to allow me to continue the work I’ve started as their independent voice in Washington fighting for better transportation and more jobs, strengthening national security and ensuring a thriving New York City economy and always doing what’s right for the people of my district.”