In this May 15, 2017, file photo, U.S. President Donald Trump, right, shakes hands with Abu Dhabi's crown prince, Sheikh Mohammed bin Zayed Al Nahyan, in the White House in Washington. Yemen's yearslong war between Shiite rebels and a Saudi-led coalition backing its exiled government has escalated with an assault on the insurgent-held port city of Hodeida. (AP Photo/Andrew Harnik) **FILE**
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