DOHA, Qatar – Over the coming days, Syria’s anti-regime camp will wrangle over reorganizing its ranks, as the United States pushes a proposal to create a new leadership body with fewer Syrian exiles and more military commanders fighting on the ground to bring down President Bashar Assad.

But there are serious doubts whether the divided and ideologically diverse factions can come together into a structure the U.S. and its allies can work with.

Hundreds of Syrian opposition figures are taking part in a five-day conference starting today in the Qatari capital Doha, seen as the most serious push yet to forge a united front to help end the 19-month conflict that has killed more than 36,000 people and left much of the country in ruins.