And Obama says that cat's out of the bag.
"Frankly, nobody is really disputing that chemical weapons were used," he said.
So, short of a shocking finding that chemical weapons were not used, it's unclear how much of an effect the U.N. results will ultimately have.
Meanwhile, the Syrian regime continues to insist rebels were behind any chemical attack. But it offers no proof to back that up.
After word broke Sunday that al-Assad had done an interview with Charlie Rose of CBS and PBS denying any involvement in chemical weaopns attacks, Kerry was asked for a response.
"The evidence speaks for itself," he said.