Saudi Crown Prince Mohammed bin Salman greeted Trump on a lavender carpet after Air Force One touched down.
While Trump met with the crown prince at Riyadh's Royal Court, Saudi men armed with gold swords waited nearby.
The official state arrival ceremony at Riyadh's Royal Court featured another lavender carpet as the honor guard stood by.
Flanked by US officials, including Secretary of State Marco Rubio, Treasury Secretary Scott Bessent, and Defense Secretary Pete Hegseth, Trump chatted with the crown prince before a coffee ceremony at the Royal Court.
Elon Musk, a Trump advisor, also attended the coffee ceremony with Trump in Riyadh's Royal Court.
Trump and the crown prince looked at exhibits in Riyadh's ornate conference center during the US-Saudi Investment Forum.
Trump talked to a large crowd, including top US business leaders, inside a palatial room during the investment forum.
Nvidia CEO Jensen Huang announced during the investment forum that his company would provide Saudi AI firm Humain with thousands of its most advanced chips to power the kingdom's AI factories.
OpenAI CEO Sam Altman attended the investment forum and a VIP lunch but didn't speak at the event.
Elon Musk spoke with the governor of Saudi Arabia's Public Investment Fund during a visit to the old district of Diriyah outside Riyadh.
Crown Prince Mohammed gave Trump a tour of Diriyah, a UNESCO World Heritage Site and the ancestral home of the al Salman royal family, before the evening's state dinner.
