>> The defeat of Islamic state in its de facto capital of Raqqa this week, marks the start of a bigger test for the United States under president Donald Trump. Foreign correspondent Arshad Mohammed.>> The magnitude of the remaining challenge is still huge. Who's gonna govern that territory? Who's gonna provide security there?
How are you going to prevent Syrian President Assad, who's backed by Iran and Russia, from trying to retake the territory? It sort of opens up a Pandora's box of problems.>> Beyond that looms the larger question of Trump's commitment in Syria, as the aggressive backing of Russia and Iran strengthen the hand of Assad.
>> The difficulty is, it's hard to see what is the US comprehensive strategy even after this. Does Assad stay, or does Assad go? How do you get all the different players in the region, the Syrian government, the people who oppose the Syrian government, the Kurds, Iran, Russia, Turkey, the United States.
How do you get all these players to try to reach some kind of an agreement, for a country that has basically been fractured over the last more than six years?>> Former President Obama was famously cautious about getting involved in another Middle East conflict, after the wars in Iraq and Afghanistan.
While President Trump bombed a Syrian airbase in retaliation for an alleged chemical attack, his administration has shown few signs of breaking with Obama's hands-off policy. But Trump has claimed credit for the fall of Raqqa.>> What they would say, and what President Trump said, is that he has changed the rules of engagement and given US commanders greater latitude to pursue the battle against Islamic State.
>> The loss of Raqqa, coming after severe setbacks for Islamic State in Iraq as well. But Mohammed says there is still a danger of ISIS morphing into an insurgency against US-backed forces. US officials say the ambush killings of four US Special Forces soldiers in Niger in recent weeks, were likely carried out by extremists linked to Islamic State