It was a mega boost for a MAGA Long Island pol.

President Trump endorsed Nassau County Executive Bruce Blakeman in a glowing social media post, saying the politician “is doing an incredible job.”

“Bruce is MAGA all the way, and has been with us from the very beginning,” Trump said of the Republican on Truth Social Tuesday night.

“He is working hard to Grow the Economy, Cut Taxes, Reduce Regulations, Stop Migrant Crime, Support our Great Law Enforcement, Protect our always under siege Second Amendment, and Safeguard our Community.

“Bruce Blakeman has my Complete and Total Endorsement for Re-Election – HE WILL NEVER LET YOU DOWN!”

Blakeman, who is seeking re-election in November, has said that Trump has been “enthusiastic” about his campaign against Democrat Seth Koslow.

Trump pledged to fight so the Massapequa Chiefs could keep their name in the face of a New York State ban on Native American imagery. The president is a fan of the county, Blakeman said.

“He has spent a lot of time in Nassau County, and he likes what we’ve done,” Blakeman told The Post, boasting that U.S News and World Report ranked the 516 as the safest community in America and that Niche called it the best place to live in the nation.

“We’ve taken a very, very blue county and made it a very, very red county by just sticking to common sense principles and American values that President Trump shares with us — such as not being a sanctuary county, hiring more police officers,” Blakeman added.

He also said that not raising taxes for three years and achieving seven bond upgrades is “unprecedented” for Nassau.

“Wall Street likes what we’re doing,” said Blakeman. “Those are all things that Trump admires, and those are things that we value.”