Jordanian King Abdullah told White House senior adviser and presidential son-in law Jared Kushner on Wednesday that a Palestinian state can only be created along the border lines that existed before the 1967 Six-Day War.

“His Majesty stressed the need for a comprehensive and lasting peace based on a two-state solution, leading to an independent Palestinian state on 4 June 1967 lines with east Jerusalem as its capital,” according to a statement from Abdullah’s palace.

During the Six-Day War, Israel retook Jerusalem’s Western Wall and surrounding areas, in addition to gaining hold of the Golan Heights.

U.S. President Donald Trump officially recognized in December 2017 that Jerusalem as Israel’s capital, in addition to relocating the U.S. embassy in Israel there five months later, and last March officially recognized Israel’s control of the Golan Heights.

Kushner’s trip to Jordan occurred a day after visiting Morocco. He is scheduled to travel next to Israel, followed by addressing global officials at the annual Bilderberg Meeting in Montreux, Switzerland, on Saturday. He will then meet with Trump in London during his father-in-law’s state visit.

The administration will begin rolling out its peace proposal, dubbed the “deal of the century,” at a conference in Bahrain scheduled for June 25-26 to promote stimulating the economy in the Palestinian territories.

The Palestinian Authority, China and Russia have announced they will boycott the summit, while Saudi Arabia and the United Arab Emirates have stated otherwise.