Which President has not been caught lying?
It's part of the job.
I don't think that rises to the level of being called
"despot" or "war criminal".
George W. Bush, along with the likes of Colin Powell and Dick Cheney, indeed directly caused war crimes, torture, and large-scale destruction in Iraq. I don't think it should take any lengthy argument or legal technicality to conclude that he is a war criminal and that he deserves to be tried as such.