WASHINGTON (AP) — The architect of the Trump administration’s delayed Mideast peace plan is leaving the White House in the face of widespread skepticism about the viability of the as-yet unseen proposal and questions about whether the vision for a resolution to the Israeli-Palestinian conflict will ever be released.

Jason Greenblatt, a long-time lawyer for the Trump Organization who became the president’s special envoy for international negotiations, announced his departure Thursday, saying he would return to the private sector in the coming weeks and spend more time with his family in New Jersey.

Greenblatt had worked closely with Jared Kushner, Trump’s son-in-law and senior adviser, on developing the peace plan.

Despite his title and spending nearly three years in the post, Greenblatt never participated in negotiations between the Israelis and Palestinians, who cut off ties with the administration after Trump recognized Jerusalem as Israel’s capital. Instead, his role had been to draft the plan, and officials said that has now been finished.