Trump also called Mohammed bin Zayed al-Nahyan, the crown prince of Abu Dhabi, the capital of the U.A.E., Wednesday.
Saudi Arabia said it was committed to "decisive and swift action to cut off all funding sources for terrorism" in a statement carried by the state news agency SPA, while Bahrain hailed USA efforts to ensure "international solidarity" on the issue.
Addressing a White House news conference, the president said Qatar had "historically been a funder of terrorism at a very high level". CNN is reporting that USA investigators believe Russian hackers may have been behind the effort and the Federal Bureau of Investigation has been sent to Qatar to help investigate.
"This list is connected to Qatar and serves suspicious agendas in an indication of the duality of Qatar policies", said the statement from Saudi Arabia, the United Arab Emirates, Egypt and Bahrain.
"Qatar has a history of supporting groups that span the spectrum of political expression, from activism to violence", Tillerson said.
Qatar's foreign minister has insisted his country was combating terror financing and "protecting the world from potential terrorists".
Crisis in the Gulf: Why is Qatar under siege?
Saudi Arabia, the UAE, Egypt and Bahrain have suspended all flights to and from Doha and closed off sea and air links to Qatar.
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Kuwait - which unlike most of its fellow Gulf Cooperation Council members has not cut off ties with Qatar - has been leading efforts to mediate.
Its emir Sheikh Sabah al-Ahmad Al-Sabah held talks on Wednesday with Qatari counterpart Sheikh Tamim bin Hamad Al-Thani, following talks with senior UAE officials and Saudi King Salman. Home to some 10,000 troops, it is central to the US-led fight against the Islamic State group in Iraq and Syria.
Qatar's USA ambassador, Meshal bin Hamad Al Thani, told The Associated Press his country is counting on Washington to persuade Saudi Arabia and others to back down.
"No more funding", Trump said.
Doha has for years forged its own alliances in the region, often diverging from the politics of the six-state GCC and taking in leaders of the Muslim Brotherhood, the Palestinian Hamas and members of the Afghan Taliban.
"The emir has no plans to leave Qatar while the country is under a blockade", the official told Reuters. The outreach came as USA officials told CNN they were observing increased Qatari military activity as the country placed its forces on the highest state of alert over fears of an military incursion. "We need to put everything in check".
Qatar said on Thursday the action against it was endangering stability in Gulf but it was not prepared to compromise to settle the dispute.
Bahrain on Thursday followed the UAE in announcing that expressing sympathy for Qatar over the sanctions was an offence punishable by jail.
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