A Long Island divorce lawyer sexually assaulted and seduced a client while raking in $75,000 from her in legal fees, a lawsuit claims.

Louise Pierre-Louis, 63, says her Floral Park lawyer, Gregory Dale Abram, 64, abused and extorted her while repping her in her divorce for more than two years, according to her Nassau County suit.

“He’s a monster,” Pierre-Louis, a nurse from Baldwin, told The Post.

She says Abram first sexually assaulted her in July 2016 as she was leaving his office. He “grabbed her crotch and stated, ‘If Trump can grab a p- - -y he wants, so can I,’ ” her suit says.

A month later, Abram assaulted her again when he told her after a meeting to get in his car, then drove her to a garage, unzipped his pants and told her to “suck it,” her suit claims.

She rebuffed him, according to the court papers.

The lawyer preyed on his client’s vulnerability long enough to persuade her to begin a sexual relationship with him, according to court papers.

But Pierre-Louis says it wasn’t all consensual.

Her lawyer, Ronald Zimmer, said Abram has “broken every single rule, every code of ethics that an attorney has to adhere to, which prevents any kind of relationship with a client.”

Abram denied any wrongdoing to The Post.

“If I was to have accosted her as she said on Day One, why wouldn’t she say, ‘I don’t want you to represent me,’ ” Abram said. “It’s a ploy to avoid paying. It’s kind of ridiculous.”