WASHINGTON — Jared Kushner, President Trump’s son-in-law and senior adviser, will soon travel to the Middle East for yet another foray into trying to forge a peace deal between Israelis and Palestinians, one of the most difficult diplomatic assignments of the Trump administration.

Mr. Kushner, who traveled to the region in June, will be accompanied on the trip by Jason Greenblatt, a special representative for international negotiations, and Dina Powell, a deputy national security adviser. No date was announced.

The three will hold meetings with leaders from Saudi Arabia, the United Arab Emirates, Qatar, Jordan, Egypt, Israel and the Palestinian Authority, said a White House official. The discussions will focus on resolving the impediments to peace negotiations between the Israelis and Palestinians, but will also cover combating extremism, the official said.

That topic could take Mr. Kushner even deeper into territory generally reserved for Secretary of State Rex W. Tillerson. A bitter feud between Saudi Arabia and Qatar over how to combat extremism has split the Gulf Cooperation Council, putting a host of American priorities in the region at risk. Mr. Tillerson spent hours on the phone and days on the ground in the Middle East recently in an unsuccessful attempt to resolve the standoff, which led Saudi Arabia and three other Arab states to slap an embargo on Qatar.