WASHINGTON (AP) — 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...