Trump stood in the Rose Garden and accepted the view of Qatar's regional rivals, including Saudi Arabia and the United Arab Emirates, that the small energy-rich emirate was providing money to terrorist groups, cozying up to Iran and harboring fugitives.
The leaders are set to carry a gathering and dealing lunch that the White Home mentioned would concentrate on strengthening ties, together with safety and financial points.
The two sides also affirmed their shared commitment to continued security cooperation, as the United States announced to sell Qatar Advanced Precision Kill Weapon Systems (APKWS) for an estimated cost of 300 million US dollars also on Monday.
Trump suggested that Washington is working to end the feud between Qatar and its Arab neighbours.
At the launch, Sheikh Hamad al-Thani, CEO of Al Dana Company, said: "Qatar Taxi has partnered with one of the world's leading companies in this field, which will be based in Doha, to ensure the security, privacy and secrecy of our users and their data".
Qatar denies this and Washington wants to mediate a truce.The emir met US Defense Secretary Jim Mattis on Monday and is due to meet Trump on Tuesday.
The two leaders agreed in a telephone call that members of the six-nation Gulf Cooperation Council "can and should do more to increase coordination with each other and with the United States", the White House said in a statement.
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Al-Thani told reporters the region could not tolerate "a war criminal" like Syrian President Bashar al-Assad. Qatar denies all those charges.
Yet nearly a year later, the crisis has remained deadlocked, despite Qatar's efforts to address at least the USA concerns, even allowing Treasury Department officials into its central bank.
Last summer, Trump took the side of Saudi Arabia and other Persian Gulf countries in their ongoing diplomatic crisis with Qatar.
Despite the past tensions, there were signs that Trump was warming to the Qataris.
"We have a gentleman on my right who buys a lot of equipment from us, a lot of purchases in the United States and a lot of military airplanes, missiles, lots of different things", Trump said.
He also praised the Qatari emir for strongly advocating against extremism in the Middle East.