BEIRUT – Syria's most prominent defector offered himself up Thursday as a figure to unite the fractious opposition, saying he failed to persuade his former friend, President Bashar Assad, to end a bloody crackdown that has killed thousands of Syrians.

The remarks by Manaf Tlass, a Syrian brigadier general until he abandoned the regime this month, were published in a Saudi newspaper just as opposition factions gathered in Qatar to try to agree on a transitional leadership if Assad's regime falls.

Some opposition members are deeply skeptical of Tlass, believing he's far too close to the regime.