"Stop funding (terrorism). Stop teaching hate. Stop the killing," Trump told reporters in the Rose Garden of the White House in a joint news conference with the visiting Romanian President Klaus Johannis.
In a strong-worded opening remarks, Trump alleged that Qatar was funding terrorism at the "highest level" and asked other countries doing the same to stop with immediate effect.
"The nation of Qatar, unfortunately, has historically been a funder of terrorism at a very high level. And in the wake of that conference, nations came together and spoke to me about confronting Qatar over its behaviour," Trump told reporters at the news conference.
"I want to call on all of the nations to stop immediately supporting terrorism, stop teaching people to kill other people, stop filling their minds with hate and intolerance. I won't name other countries, but we are not done solving the problem. But we will solve that problem. Have no choice," Trump said.
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"No civilised nation can tolerate this violence or allow this wicked ideology to spread on its shores. I addressed a summit of more than 50 Arab and Muslim leaders, a unique meeting in the history of nations, where key players in the region agreed to stop supporting terrorism, whether it be financial, military or even moral support," Trump said.
Trump said defeating ISIS and other terror organisations is something he has emphasised all during his campaign.
"To do that, stop funding, stop teaching hate and stop the killing," he said.
"For Qatar, we want you back among the unity of responsible nations. We ask Qatar and other nations in the region to do more and do it faster," the US President said.
"I want to thank Saudi Arabia and my friend King Salman and all of the countries who participated in that very historic summit. It was truly historic. There has never been anything like it before and, perhaps, there never will be again," he said.
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