In 1991, Trump sold his 282-foot yacht named "The Trump Princess" to a Saudi billionaire for $20 million.

Donald Trump waves to reporters with his wife, Ivana, as they board their yacht, "The Trump Princess," in New York in 1988.

At the time, Trump was almost bankrupt and looking to make some fast cash, reportedly selling the yacht to for one third less than he paid for it.

In 1995, Trump also sold New York City's Plaza Hotel to

In 2001, Trump sold the 45th floor of Trump World Tower to the Saudi court for $4.5 million. In 2008, the floor became part of the Saudi mission to the United Nations.

Trump World Tower

The New York Daily News revealed the sale in September 2016 after Trump had attacked Hillary Clinton on the campaign trail for

Saudi Arabia — and I get along great with all of them. They buy apartments from me.

After announcing his presidential candidacy, Trump incorporated several companies with names indicating that they may do business in Saudi Arabia, such as "THC Jeddah Hotel Advisor LLC." Jeddah is the second largest city in Saudi Arabia.

Trump shakes hands with then-Crown Prince Mohammed bin Zayed Al Nahyan during a meeting with leaders at the Gulf Cooperation Council Summit in Riyadh on May 21, 2017.

After he was elected, Trump's company, the Trump Organization, announced that it had shut down those companies.

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Since Trump took office, the Saudi government has also been a major customer of the president's hotels in New York and Washington DC.

An exterior view of the entrance to the new Trump International Hotel at the old post office on October 26, 2016 in Washington, D.C.

Between October 2016 and March 2017, lobbying group working for the Saudi government, spent $270,000 at Trump International Hotel in DC for lodging, catering and parking.

paid for 500 rooms for six groups of US military veterans to lobby Congress against the

In June 2017, the Trump Organization announced it would donate all profits from the sales to charity.

In March 2018, the Trump organization said it had donated

Also in March 2018, members of Crown Prince Mohammed bin Salman's entourage stayed at the president's Trump International Hotel in New York, which caused the hotel's quarterly profits to go up 13 percent.

Protesters march in front of Trump International Hotel on April 22, 2017.

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In 2017, Saudi Arabia said it would invest $20 billion in a US infrastructure fund before Trump unveiled a $200 billion plan to fix the US's roads, airports and more.

Blackstone CEO Stephen Schwarzman listens as President Donald Trump speaks during with business leaders in the State Dining Room of the White House on Feb. 3, 2017.

Blackstone CEO Stephen Schwarzman, who visited Saudi Arabia with Trump in 2017, has since withdrawn from an investment meeting in Saudi Arabia planned for next week.

Trump has also intimately engaged with the Saudi court in other ways, including participating in a traditional sword dance known as ardah.

President Donald Trump poses for photos with ceremonial swordsmen on his arrival to Murabba Palace, as the guest of King Salman bin Abdulaziz Al Saud of Saudi Arabia, on May 20, 2017, in Riyadh.

In May 2017, Trump simultaneously touched an odd glowing orb with Saudi King Salman and Egypt's President Sisi, which reportedly symbolized their intentions to combat exremism.

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Trump has also said that the US cannot rescind on its $110 billion arms deal, $14.5 billion of which has gone through to Saudi Arabia, arguing that Riyadh would just turn to China or Russia.

President Trump shows a chart highlighting arms sales to Saudi Arabia during a meeting with Saudi Crown Prince Mohammed bin Salman in the Oval Office on March 20, 2018, in Washington.

The US had already faced criticism for the arms deal over the Saudi-led coalition's execution of the war against Iranian-backed Houthis in Yemen, which has become one of the worst humanitarian disasters in the world.

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Saudi Crown Prince Mohammed bin Salman and Trump's son-in-law and senior adviser, Jared Kushner, have also formed a cozy relationship as they have discussed initiatives to reshape the Middle East since Trump was elected.

President Trump, flanked by White House senior advisor Jared Kushner (2nd R) and chief economic advisor Gary Cohn (R), delivers remarks to reporters after meeting with Saudi Arabia's Deputy Crown Prince Mohammed bin Salman at the Ritz Carlton Hotel in Riyadh on May 20, 2017.

You can read more about that here and here.

But Trump has denied any financial ties to the Saudi court.

President Trump shakes hands with Saudi Deputy Crown Prince Mohammed bin Salman in Riyadh on May 20, 2017.