FULL Ceremony: US President Donald Trump Arrives in Saudi Arabia (May 20, 2017)

Dogged by controversy at home, President Donald Trump opened a nine-day foreign trip on Saturday in Saudi Arabia, looking to shift attention from a spiraling political firestorm over his firing of former FBI Director James Comey last week.

With delicate diplomatic meetings facing him, including three summits, Trump faces a challenge of advancing his "America First" agenda without alienating key allies during his first trip abroad.

Stepping off Air Force One in 100-degree heat with his wife, Melania, Trump and his entourage received a red-carpet welcome from Saudi King Salman.