Freshman Rep. Rashida Tlaib may take great pains to deny she is anti-Semitic, but she’s just launched her congressional career by resorting to one of the oldest and most blatantly anti-Jewish canards.

At issue is a bill that aims to limit the anti-Israel Boycott, Divestment and Sanctions campaign. Tlaib, the first Palestinian-American in Congress, accused the measure’s supporters of dual loyalty.

“They forgot what country they represent,” the Michigan Democrat and unapologetic BDS supporter tweeted.

In fact, the bill in question does several things: It would also codify a memo of understanding with Israel, reimpose sanctions on entities funding the Syrian government and strengthen the US-Jordan relationship. But the controversy centers on the section that authorizes state and local government to combat BDS.

Some oppose it on the belief that restricting BDS limits First Amendment speech rights. But Tlaib just couldn’t stop there.

American Jews have long been slandered with charges of dual loyalty for their support of Israel. Activists such as Linda Sarsour hurl it more and more often these days. It was used against opponents of the Iran nuclear deal and supporters of the war in Iraq.

Yet it’s particularly ironic for Tlaib to make the charge, since she has vowed to “be a voice” for her relatives in the West Bank and declared that her “passion for justice is rooted in my beautiful Palestine.”

Is she just trying to top the ruckus she’d already raised by publicly taunting President Trump with a vow to “impeach the motherf - - - - r”?

Objectionable as that remark was, it didn’t venture beyond the uncouth and obscene. Her latest tirade is a far broader and lower smear, which also puts the lie to her claim that she merely opposes Israel.

So far, other Democrats have remained silent on Tlaib’s disgraceful canard. The party’s depressing drift of recent years makes that no real surprise. But it still makes them abetters, enablers — and equally guilty.