Green Party candidate Laurence Hirsh has formed a campaign committee to run in the April 19 special election in Nassau County’s 9th Senate District for the seat vacated by ex-Senate Majority Leader Dean Skelos.

Meanwhile, the Nassau Police Benevolent Association announced Tuesday that it had endorsed the Republican candidate in the race — former Nassau County Bar Association president Christopher McGrath.

Hirsh, 56, an accountant from Valley Stream, said his top priorities include imposing a 1 percent tax on all Wall Street transactions, setting term limits for Albany lawmakers and ending a State Board of Elections policy of allowing Democratic and Republican candidates to run on minor party lines, including the Green Party.

“I want to make a premier effort to eradicate corruption in Albany and bring integrity back to the state government,” Hirsh said.

Nassau Democrats are running Assemb. Todd Kaminsky, a former federal prosecutor from Long Beach, in the special election, which will be held on the day of the New York presidential primary.

Minor party candidates such as Hirsh do not need to collect petition signatures to get on the ballot in special elections, officials said.

Hirsh ran on the Green Party line in November for Nassau’s 3rd Legislative District, winning 1.2 percent of the 7,717 votes cast. Incumbent Legis. Carrié Solages (D-Elmont) won.

The Green Party has 380 registered voters in the 9th Senate District, compared with 96,701 Democrats, 77,381 Republicans and 51,638 registered voters unaffiliated with any major political party, according to State Board of Elections records.

In a statement Tuesday, McGrath, a personal injury attorney from Hewlett, said he was “proud” to get the endorsement of the PBA and its 5,000 active and retired members.

“As someone who has worked closely with the brave men and women who put their life on the line by protecting us every day, and who worked tirelessly after the tragedy of 9/11, I am humbled by their endorsement and their confidence in me to represent our communities in the State Senate,” McGrath said.

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Skelos, of Rockville Centre, was convicted in December of eight counts of bribery, extortion and conspiracy.