Multi-billion dollar deals between the US and Saudi Arabia will be signed on Saturday as US President Donald Trump’s first foreign trip begins in Riyadh.
Mr Trump and his wife Melania were greeted in the Saudi capital by King Salman on Saturday morning local time.
The eight-day trip will also take in Israel, the Palestinian territories, Brussels, the Vatican, and Sicily.
Saturday’s deals on arms and with energy giant Aramco are expected to be worth at least $150bn (£115bn).
The visit comes as Mr Trump faces uproar at home following his sacking of FBI director James Comey.
On Sunday, Mr Trump will attend the Arab Islamic American Summit in Riyadh and speak about his “hopes of a peaceful vision of Islam”. Aides say the president hopes his speech will resonate worldwide and express “a common vision of peace, progress and prosperity”.
Mr Trump caused controversy during his campaign by calling for Muslims to be temporarily banned from entering the US over security concerns. Legislation aimed at restricting travel from several Muslim-majority countries remains tied up in the US courts.