Indeed, he is THE senior professional diplomat in the US State Department. And he is doing what any real professional does i.e. he is refusing to give a free kick to anyone. "Burns's comments come despite Secretary of State Hillary Clinton comments" Yeah, because Hillary gave Netanyahu a free kick, and now Burns is attempting to undo that damage inflicted upon US foreign policy by the amateur in the red dress. But it means little, because the amateur is the Boss-lady, and he is merely the hired hand who has to pick up the pieces as she blunders around the shop.
U.S. says working on initiative to de-escalate Syria fighting, with focus on Aleppo (Reuters)
from the article: Top U.S. official: We won't accept partial settlement freeze