President Donald Trump signed a $600 billion agreement with Saudi Arabia on Tuesday that includes a major defense contract and substantial investments in artificial intelligence—as U.S. business executives made their own set of deals at a conference in the backdrop of Trump’s visit to Riyadh, the first stop on his four-day tour of the Middle East.

The president will also go to Qatar and the United Arab Emirates, and is expected to receive lavish hospitality throughout the trip. He has told advisers that he wants to sign deals worth more than $1 trillion.