By Yousef Saba, Gram Slattery, Pesha Magid and Federico Maccioni RIYADH (Reuters) - U.S. President Donald Trump signed a strategic economic agreement with Saudi Arabia on Tuesday as the oil power rolled out the red carpet for him at the start of a tour of Gulf states aimed at drumming up trillions of dollars in investments.

RIYADH, Saudi Arabia — President Trump arrived Tuesday for the first leg of his Middle East tour in the Saudi capital of Riyadh, where he was welcomed with a pomp-and-circumstance-filled ceremony and a high-powered lunch with top business leaders and government figures before giving a speech at an investment forum.

The U.S. President is embarking on a four-day trip to Saudi Arabia, Oman, and Qatar with a $1 trillion wish-list.