And Trump has recently hinted at continued progress, tweeting in January that the \"Caliphate will soon be destroyed,\" and in February that, \"The U.S. will soon control 100% of ISIS territory in Syria.\"

\"PHOTO:
Evan Vucci/AP
PHOTO: President Donald Trump speaks at the White House, March 5, 2019.
>

Syrian Democratic Forces (SDF), backed by the U.S.-led coalition, resumed the offensive on Baghouz on March 1, after they had paused for more than a week to allow an estimated 10,000 civilians and ISIS families to leave the town.

An SDF official told the Associated Press that ISIS gunmen in Baghouz were still prepared to fight.

\"This is not the end. We are maybe on the threshold of a new battle,\" he said.

In terms of tackling the ideological threat ISIS poses, Bolton said \"as long as the ideology is out there it continues to be a threat.\"

\"The ISIS threat, the al-Qaeda threat, the terrorist threat is an ideological threat worldwide and it's something that I think we have to be vigilant against for the foreseeable future. That's the reality,\" Bolton said.

In a Pentagon report released last month, it was indicated that without sustained pressure the Islamic State could reconstitute in Syria within six to 12 months.

\"PHOTO:
Leah Millis/Reuters
PHOTO: U.S. National Security Adviser John Bolton walks to an interview outside the White House in Washington, March 5, 2019.
>

Bolton said he's \"very optimistic\" that British and French allies will help aid the U.S. in the case of a possible resurgence.

\"It hasn't happened formally yet, but they're looking at it. I think it's very important that we try and get this up. It may or may not succeed,\" Bolton said.

As the fight against the Islamic State in Syria winds down, Trump's administration is leaving open the possibility that some of the group's foreign fighters be sent to the U.S. detention facility at Guantanamo Bay, Cuba.

Trump tweeted last month that the U.S. is asking allies to have foreign ISIS fighters detained in Syria returned to their home countries and put on trial.

\"The United States is asking Britain, France, Germany and other European allies to take back over 800 ISIS fighters that we captured in Syria and put them on trial\" Trump tweeted. \"The alternative is not a good one in that we will be forced to release them.\"

\"Time for others to step up and do the job that they are so capable of doing,\" Trump tweeted.

The United States is asking Britain, France, Germany and other European allies to take back over 800 ISIS fighters that we captured in Syria and put them on trial. The Caliphate is ready to fall. The alternative is not a good one in that we will be forced to release them........

— Donald J. Trump (@realDonaldTrump) February 17, 2019

....The U.S. does not want to watch as these ISIS fighters permeate Europe, which is where they are expected to go. We do so much, and spend so much - Time for others to step up and do the job that they are so capable of doing. We are pulling back after 100% Caliphate victory!

— Donald J. Trump (@realDonaldTrump) February 17, 2019
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