Attendees of the U.S.-Saudi Investment Forum included scores of the world's most powerful CEOs, among them Elon Musk, Jensen Huang and Larry Fink.

President Donald Trump plans to deliver remarks at a U.S.-Saudi "investment forum" in Riyadh, where Middle Eastern businesses are pledging $600 billion to invest in a series of deals in the U.S.

""With this trip, we're adding over $1 trillion more in terms of investment into our country and buying our products," Trump told the U.S.-Saudi Investment Forum in Riyadh. (Reporting by Gram Slattery;