He didn't lie about Iraq trying to develop WMD or having sarin gas or yellow cake uranium. And Iraq was bragging about their "nuclear mujadeen" in their state newspapers.
But Bush kept the actual findings classified and never defended his position.
Trump says in his stump speeches all the time that Iraq used chemical weapons against the Iranians and that’s fine with him.
WMD’s for him are nuclear weapons and Iraq did not have those nor was it developing them despite what Colin Powell said at the UN.