Representatives of Mr. Friedman, a bankruptcy lawyer from Long Island who has long done legal work for Mr. Trump, told Senator Benjamin L. Cardin of Maryland, the senior Democrat on the Foreign Relations Committee, and other officials that he would express regret for saying that supporters of the liberal pro-Israel group J Street were “worse than kapos,” the Jewish prisoners who worked for the Nazis in concentration camps.

Mr. Friedman’s appointment has drawn strident opposition from liberal Jewish groups, who viewed it as an ominous sign of Mr. Trump’s intentions in the region. Mr. Friedman has raised money for a settlement in the West Bank, derided the two-state solution and pushed to move the American Embassy to Jerusalem from Tel Aviv.

The White House, however, has slowed down its plan to move the embassy, even though Mr. Trump vowed to do it during the campaign. And after appearing to give the Israeli government a free hand in settlement construction, the president told an Israeli newspaper, Israeli Hayom, last week that settlements “don’t help” the peace process. “Every time you take land for settlements,” he said, “there is less land left.”

Mr. Netanyahu’s main goal this visit, analysts said, is to marshal American support for rigorously enforcing the Iran nuclear deal. That position has broad support inside the administration, including from Mr. Trump’s chief strategist, Stephen K. Bannon, and Defense Secretary Jim Mattis.

But the biggest hawk on Iran in the White House may have been Mr. Flynn. In his only public appearance as national security adviser, on Feb. 1, he warned Iran that it was being “put on notice” for what he said was a pattern of aggressive behavior in the region. He also announced new sanctions to punish Tehran for launching a ballistic missile.

With Mr. Flynn no longer in the picture, and Mr. Mattis and Secretary of State Rex W. Tillerson are traveling, the Netanyahu-Trump meeting is likely to include Mr. Kushner and Mr. Bannon. That lineup, analysts said, could tilt the conversation more toward a potential peace initiative than to additional steps to pressure Iran. Mr. Netanyahu’s right-wing coalition is deeply hostile to new peace negotiations with the Palestinians.

“The one issue Bibi has no room for maneuver on — the peace process — is the one issue Trump wants to talk about,” Martin S. Indyk, a special envoy for Middle East peace during the Obama administration, said, using Mr. Netanyahu’s nickname. “On the one issue that Bibi wants to talk about, Iran, he’s missing his wingman, General Flynn. His wingman has just been shot down.”