President Donald Trump on Friday said there will be a US announcement on Syria in the next 24 hours, as European allies and Russia wait to see how he will carry out his December decision to pull out all US troops from the country. "We have a lot of great announcements having to do with Syria and our success with the eradication of the caliphate and that will be announced over the next 24 hours," Trump said during Rose Garden event at the White House. His comments came as the top Pentagon official said Friday he foresees a "bigger and stronger" American-led international coalition combatting ISIS globally. Pat Shanahan, on his first trip abroad as the acting secretary of defense, spoke after meeting in Munich with representatives of the dozen or so countries that provide troops in Iraq and Syria. "While the time for US troops on the ground in northeast Syria winds down, the United States remains committed to our coalitions cause, the permanent defeat of ISIS, both in the Middle East and beyond," Shanahan said in remarks to reporters. A senior defense official, speaking later, said Shanahan did not discuss a timetable for the US withdrawal from Syria, which other officials have said is expected to be completed in April. The US has about 2,000 troops in Syria and about 5,200 in Iraq.