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.

Trump met with Saudi Crown Prince Mohammed bin Salman and attended a US-Saudi investment forum along with Elon Musk and other top CEOs.

President Donald Trump was in Saudi Arabia on Tuesday, the first leg of his three-nation visit to the Middle East this week meant to tackle multiple crises and conflicts across the region.