The longer a summit between the US and Russia on Syria is delayed, the more Iran can push forward and consolidate its gains in Syria. Perhaps that is part of a covert plan to derail any rapprochement between the US and Russia, which Trump had openly intended to pursue - which would also, necessarily, have involved driving Iran and Russia as far apart as possible. Have the Democrats once again become useful idiots, but this time for Iran? Haley also pointedly did not answer questions on whether the US backs ousting Assad.
Haley's statement is here.