The final battle to clear the village of Baghouz is now playing out after 20,000 civilians were evacuated from the area in the eastern province of Deir-al-Zour over the past few weeks.
It should be noted that Trump's latest rhetoric seems a preparation for quick pullout, or big coming announcement: "It should be formally announced sometime, probably next week, that we will have 100% of the caliphate", the president said Wednesday during an anti-ISIL coalition speech at the State Department.
"We have special units whose job it is to direct civilians to corridors they can cross" to safety, he said.
SDF fighters had so far seized 41 positions but had faced counter attacks early on Sunday that had been repelled, Mustafa Bali, head of the SDF media office, told Reuters.
Syrian opposition activists say Islamic State militants have attacked US -backed fighters near an oil field in the country's east, triggering airstrikes by the USA -led coalition.
The Pentagon is preparing to pull all US forces out of Syria by the end of April, even though the Trump administration has yet to come up with a plan to protect its Kurdish partners from attack when they leave, current and former USA officials said.
The deputy commander of the US-led coalition fighting the group, Major General Christopher Ghika, described the size of the last IS pocket as "now less than one percent of the original caliphate".
With many foreign governments reluctant to repatriate citizens who supported ISIS, and Syria's Kurds insisting they are unable to hold the prisoners long term, rights organisations have warned that foreign fighters face illegal rendition to Iraq.
This file image made from video posted on a militant website July 5, 2014, shows the leader of the Islamic State group, Abu Bakr al-Baghdadi, delivering a sermon at a mosque in Iraq.More news: Trump is in 'very good health', says White House doctor
That figure includes some 3,200 suspected militants detained by the SDF, according to the monitor, which relies on sources inside Syria for its information.
The Observatory said that since the SDF began its offensive against IS in the area on September 10, some 1,279 IS gunmen and 678 SDF fighters have been killed.
After years of battles, the SDF holds hundreds of foreigners accused of belonging to the extremist group in its custody, as well as members of their families.
Scores of Isis fighters are now besieged in two villages, or less than 1% of the self-styled caliphate that once sprawled across large parts of Syria and Iraq.
Obviously, both these divergent goals are impossible to achieve, unless Washington is planning to maintain some sort of long-term military presence in Syria.
The Turkish offensive against Kurdish militias was postponed in January after Erdogan's conversation with Trump, which ended in a plan to create a 30-kilometre (18-mile) buffer zone in Syria.
Earlier on Saturday, Isis militants attacked SDF fighters near an oil field in the country's east, triggering airstrikes by the US-led coalition.
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