US President Donald Trump has arrived in Riyadh for a four-day Middle East tour focusing on economic deals and seeking a $1 trillion investment in the US. He plans to offer Saudi Arabia a $100 billion arms package while addressing regional security concerns.

Before Trump began his visit to Saudi Arabia, Qatar and the United Arab Emirates, his sons Eric and Donald Jr. had already traveled the Middle East extensively in recent weeks. They were drumming up business for The Trump Organization, which they are running in their father’s stead while he’s in the White House.