Jared Kushner and Ivanka Trump walk with their children at the lighting of the National Christmas Tree on Thursday.

WASHINGTON – Jared Kushner, President Trump’s son-in-law, called Michael Flynn in December 2016 and told him to call members of the UN Security Council in an effort to stop a vote on a resolution critical of Israeli settlement policy, according to a person who was present in the room when Flynn took the call.

Flynn then called Russia’s then-ambassador to the United States to seek his assistance, and later lied to the FBI about having done so, according to documents filed in federal court Friday by special counsel Robert Mueller that explained Flynn’s guilty plea of lying to federal agents.

The documents do not say on whose behalf Flynn contacted Sergey Kislyak, the Russian ambassador, identifying the person only as “a very senior member of the Presidential Transition Team.”

But a Trump transition official who was in the room where Flynn took a call regarding the upcoming UN Security Council vote said Flynn identified the caller as Kushner.

“Jared called Flynn and told him you need to get on the phone to every member of the Security Council and tell them to delay the vote,” the person said.

If confirmed, that call would bring prosecutors one step closer to Kushner, who also serves as a senior adviser to Trump.

Kushner, the source said, told Flynn during the phone call that “this was a top priority for the president.”

The source says Flynn took the call at the Trump transition team’s offices in the General Services Administration headquarters in northwest Washington. After hanging up, Flynn told the entire room that they’d have to start pushing to lobby against the UN vote, saying “the president wants this done ASAP.”

At the time, the Security Council resolution was the subject of bitter debate among the Obama administration, the incoming Trump team, and Israeli officials. The resolution condemned Israeli housing construction in East Jerusalem and the occupied West Bank as a “flagrant violation under international law” that was “dangerously imperiling the viability” of a future peace settlement establishing a Palestinian state.

The United States traditionally had vetoed similar resolutions, but the Obama administration had said it was likely to abstain, which it ultimately did, allowing the resolution to pass.

Trump, at the prodding of Israeli officials, lobbied hard against the abstention, then denounced it after it took place.