The Trump International Hotel in Manhattan saw a sharp increase in revenue during the first quarter, thanks in part to a visit from Saudi Arabia's crown prince.

The hotel's general manager wrote in a May 15 letter obtained by The Washington Post that revenue from room rentals surged 13 percent in the first three months of 2018 after two years of decline, and that gain was due in large part to a visit from Saudi Crown Prince Mohammed bin Salman.

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Saudi government officials told the Post that neither Salman nor any of his official travel guests stayed at the Trump hotel due to the room sizes being too small. However, the hotel's general manager wrote in the letter that “due to our close industry relationships we were able to accommodate many of the accompanying travelers.”

A five-day stay from several guests accompanying the crown prince was enough to boost the hotel's earnings for the entire quarter, according to the Post, which noted that neither the Trump Organization nor the Saudi Embassy would say whether Saudi Arabia's government had paid for any of the guests.

Government ethics lawyers have raised questions as to whether business dealings between the Trump Organization and foreign governments constitute a conflict of interest for the president, who did not divest fully from his businesses upon taking office last year but instead placed them into a trust controlled by his sons.

A GOP attorney hired by the Trump Organization wrote in the Texas Review of Law & Politics recently that the Trump Organization's business dealings were completely separate from the White House, according to the Post.

“The renting of a hotel room from one of the Trump businesses is not correlated to President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s performance of the duties of the Office of President,” attorney Bobby Burchfield wrote.

Trump has often dined and stayed at his own properties as president, raising questions about the government's use of the Trump Organization to financially enrich the Trump family.

Several states have filed a lawsuit arguing that Trump's use of his own businesses violated the Emoluments Clause of the Constitution, a suit which a federal judge ruled last week could go forward.