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 - U.S. President Donald Trump will arrive in Saudi Arabia on Tuesday morning to kick off a four-day swing through the Gulf region, a trip that will focus more on economic deals than on the security crises besetting the region, from the war in Gaza to the threat of escalation over Iran's nuclear program.

President Donald Trump is heading to Saudi Arabia, the first leg of his three-nation visit to the Middle East this week meant to tackle multiple crises and conflicts across the region.