The YPG seized Manbij from the Islamic State group in 2016 and U.S. forces have continued to support the Kurdish fighters in their battle against the jihadists.
"I think we're slowing things down in a smart way", he told reporters.
"We're going to discuss the intense cooperation between Israel and the United States, which will also deal with the questions following the decision, the American decisions on Syria - on how to intensify even further our intelligence and operations cooperation in Syria and elsewhere to block Iranian aggression in the Middle East, to roll it back".
But after saying troops would come home right away, and that the Islamic State group was defeated, he didn't give any specific timetable. Trump, in his December 19 pullout announcement, cited the same reasons, arguing that troops had no need to stay in the war-torn country. "I campaigned against the NEVER ENDING WARS, remember!" he added.
On Monday, Trump said on Fox News that he had conciliated Senator Lindsey Graham about Graham's concern regarding a rapid withdrawal, asserting, "I said, 'You know, I never said that I'm going to rush out.'" He added that the USA could still fight ISIS despite pulling out from Syria, positing, "You can do two things at once".More news: North Korean leader vows to visit Seoul: Cheong Wa Dae
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'ISIS is mostly gone, we're slowly sending our troops back home to be with their families, while at the same time fighting ISIS remnants, ' he said.
The White House did not immediately respond to a request for comment on Trump's withdrawal plans and if there were any official changes to them.
In response to the uproar, Trump national security advisor John Bolton will soon visit allies Turkey and Israel, which each have their own complex goals in Syria's multi-dimensional civil war.
Kuwait said on Monday it expected more Arab countries to reopen embassies in Damascus in "coming days" but added that the move would need a green light from the Arab League, which suspended Syria's membership seven years ago. If the Kurds - which Ankara considers terrorists - were to actually leave the area, there would be "no job left" there for the Turkish military, Erdogan said. "Just doing what I said I was going to do!" the president said.
It prompted Defense Secretary Jim Mattis to step down, and the US envoy to the coalition fighting Islamic State militants resigned in protest.
Trump defended his decision to withdraw USA troops from Syria, saying the battle was "lost long ago", adding, "besides that, we're talking about sand and death". It has been freed by pro-US Kurds supported by the International Coalition. "I'm not happy about it at all", he said.