"I decided, along with secretary of state Rex Tillerson, our great generals and military people, the time had come to call on Qatar to end its funding, they have to end that funding and its extremist ideology", Trump said.
Tillerson demanded that Qatar, as well as the other countries, take steps to curtail support for terrorism.
With food and other supplies disrupted and worries mounting about deepening economic turbulence, banks and firms in Gulf Arab states are seeking to keep business links to Qatar open and avoid a costly firesale of assets.
Bahrain, Egypt, one of the governments in Libya, Saudi Arabia, the United Arab Emirates and the faction in the Yemen civil war backed by Saudi Arabia and the USA broke diplomatic relations with the Qatar emirate Monday.
Foreigners residing in Qatar in possession of a Qatari residence visa would also not be eligible for visas on arrival in the UAE, an Etihad spokesman said in an email.
Saudi Foreign Minister Adel al-Jubeir said Gulf countries still saw Qatar as a "brother state".
But Qatar has rejected the accusations as "unjustified" and "baseless".
A senator on the Foreign Relations Committee, Chris Murphy, D-Conn., noticed the contradiction between Trump's and Tillerson's remarks, writing on Twitter that this is not how foreign policy is supposed to work.
Russia's state RIA Novosti news agency says the Qatari foreign minister will visit Moscow for talks with his Russian counterpart amid a diplomatic crisis between the Gulf nation and other Arab countries.
No mention of Donald Trump's state visit in Queen's Speech
Outgoing Liberal Democrat leader Tim Farron said a "slimmed down Queen's Speech shows a Government on the edge". But other key manifesto plans have either been axed or delayed after the Conservatives lost their majority.
President Donald Trump called Qatar's Emir on Wednesday (June 7) and offered United States help as efforts grew to resolve a damaging feud between the emirate and its Gulf neighbours.
Worldwide terrorism, violent extremism and religious intolerance pose grave threat not only to regional stability but also to global peace and order and must be confronted by all countries in a coordinated and comprehensive manner, the ministry said.
"We have all kinds of recordings taking place where they (Qatar) are coordinating with al Qaeda in Syria", he said.
"We have now reached a cul-de-sac in terms of trying to convince Qatar to change course", UAE state minister for foreign affairs Anwar Gargash said in an interview, accusing Doha of being "the main champion of extremism and terrorism in the region".
For its part, Bahrain blamed Qatar's "media incitement, support for armed terrorist activities and funding linked to Iranian groups to carry out sabotage and spreading chaos in Bahrain" for its decision to cut ties.
While Standard & Poor's downgraded Qatar's debt on Wednesday, Moody's Investors Service said the Gulf country's credit quality would decline if tensions with fellow GCC countries continue indefinitely. "There are other countries in the region that grapple with the same issues".
A Qatari official has said an ultimatum issued by Saudi Arabia and its allies for the emirate's citizens to leave is a violation of human rights that requires United Nations intervention. "You can't start mediation when Qatar is in denial and I think right now we are in a phase where Qatar is in denial".
Referring to the conversations that he had with leaders of the Gulf countries, Tillerson said it is clear to him based that the elements of a solution are available.
President Donald Trump, accompanied by Romanian President Klaus Werner Iohannis, speaks during a news conference in the Rose Garden at the White House, Friday, June 9, 2017, in Washington.
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