A Democratic congressman from Long Island implied that Americans should grab weapons and oppose President Trump by force, if the commander-in-chief doesn’t follow the Constitution.

Rep. Tom Suozzi made the remark to constituents at a town hall last week, saying that folks opposed to Trump might resort to the “Second Amendment.”

“It’s really a matter of putting public pressure on the president,” Suozzi said in a newly released video of the March 12 talk in Huntington. “This is where the Second Amendment comes in, quite frankly, because you know, what if the president was to ignore the courts? What would you do? What would we do?”

A listener then blurts out, “What’s the Second Amendment?”

The left-leaning Democrat says, “The Second Amendment is the right to bear arms.”

The spectators laughed — some nervously. Republicans were not amused.

“This video is incredibly disturbing. It’s surreal to watch a sitting member of Congress suggest that his constituents should take up arms against the president of the United States,” said National Republican Campaign Committee spokesman Chris Martin.

Suozzi political adviser Kim Devlin denied the pol was “advocating for an armed insurrection.”

But the Suozzi campaign at the same time seemed to double down on the comments, as they forwarded a line penned by Thomas Jefferson that called for armed resistance.

“What country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance. Let them take arms,” the quote said.

Suozzi’s comment seems to conflict with his recent push for gun control following the Parkland, Florida, school shooting.

Suozzi even participated in the March 14 student walkout for gun control outside the US Capitol — and called on the young people of his district to back tightened gun laws.

“I think we should engage the high school students of #NY03, and all of Long Island, to promote gun violence prevention legislation,” he said in a Feb. 21 tweet.

Trump himself has in the past used language similar to Suozzi’s. During the 2016 campaign, he told a crowd at a rally in North Carolina that if Hillary Clinton were elected and able to nominate a Supreme Court justice, there would be nothing that gun supporters could do. He then added: “Although the Second Amendment people — maybe there is, I don’t know.”

The remark was widely seen as a veiled call for violence, though Trump denied that was his meaning.

Suozzi, a first-term congressman elected in 2016, is seeking re-election this fall. He formerly served as Nassau County executive.

He is expected to easily win the Democratic primary and face GOP challenger Dan Debono, a former US Navy SEAL, in the general election.