WASHINGTON — President Donald Trump’s unscripted remark this week about pulling out of Syria “very soon,” while at odds with his own policy, was not a one-off: For weeks, top advisers have been fretting about an overly hasty withdrawal as the president has increasingly told them privately he wants out, U.S. officials said.

Only two months ago, Trump’s aides thought they’d persuaded him that the U.S. needed to keep its presence in Syria open-ended — not only because the Islamic State group has yet to be entirely defeated, but also because the resulting power vacuum could be filled by other extremist groups or by Iran. Trump signed off on major speech in January in which Secretary of State Rex Tillerson laid out the new strategy and declared “it is vital for the United States to remain engaged in Syria.”

But by mid-February, Trump was telling his top aides in meetings that as soon as victory can be declared against IS, he wanted American troops out of Syria, said the officials. Alarm bells went off at the State Department and the Pentagon, where officials have been planning for a gradual, methodical shift from a military-led operation to a diplomatic mission to start rebuilding basic infrastructure like roads and sewers in the war-wracked country.

The officials weren’t authorized to comment publicly and demanded anonymity.

Trump’s first public suggestion he was itching to pull out came in a news conference with visiting Australian Prime Minister Alastair Campbell on Feb. 23, when Trump said the U.S. was in Syria to “get rid of ISIS and go home.” On Thursday, in a domestic policy speech in Ohio, Trump went further.

“We’ll be coming out of Syria, like, very soon. Let the other people take care of it now. Very soon — very soon, we’re coming out,” Trump said.

The public declaration caught U.S. national security agencies off-guard and unsure whether Trump was formally announcing a new, unexpected change in policy. Inundated by inquiries from journalists and foreign officials, the Pentagon and State Department reached out to the White House’s National Security Council for clarification.

The White House’s ambiguous response, officials said: Trump’s words speak for themselves.

“The mission of the Department of Defense to defeat ISIS has not changed,” said Maj. Adrian Rankine-Galloway, a Pentagon spokesman.

Still, without a clear directive from the president, planning has not started for a withdrawal from Syria, officials said, and Trump has not advocated a specific timetable.

For Trump, who campaigned on an “America First” mantra, Syria is just the latest foreign arena where his impulse has been to limit the U.S. role. Like with NATO and the United Nations, Trump has called for other governments to step up and share more of the burden so that Washington doesn’t foot the bill. His administration has been crisscrossing the globe seeking financial commitments from other countries to fund reconstruction in both Syria and Iraq, but with only limited success.

Yet it’s unclear how Trump’s impulse to pull out could be affected by recent staff shake-ups on his national security team. Tillerson and former national security adviser H.R. McMaster, both advocates for keeping a U.S. presence in Syria, were recently fired

Trump replaced McMaster with John Bolton, a vocal advocate for U.S. intervention and aggressive use of the military overseas.