RIYADH, Saudi Arabia (AP) — U.S. President Donald Trump opened his four-day Middle East trip on Tuesday by paying a visit to Saudi Arabia’s de facto ruler, Crown Prince Mohammed bin Salman, for talks on U.S. efforts to dismantle Iran’s nuclear program, end the war in Gaza, hold down oil prices and more.

U.S. President Donald Trump touched down in Saudi Arabia on the first stop of four day visit to the region, the first major overseas trip of his second term, with a focus on securing big investments in the United States.

American tech and finance CEOs, including Elon Musk, are also expected to be in Saudi Arabia for a government-hosted conference Trump is scheduled to attend as part of his visit.