Trump used the left’s canard that Bush lied (knowingly told a falsehood) about WMD in Iraq. Plenty of people besides Bush saw the same Intelligence and agreed with the various world spy agencies that said Saddam had WMD. For Trump to use such a calumny, we see that he is either profoundly ignorant of these events and the facts surrounding the war or that he has no shame in choosing a calumny. Neither one speaks well of his character and his capability to deal in good faith with others.
He is not part of the establishment political-intelligence apparatchik and Trump, like most Americans of all income classes, has been steeped in what the chattering classes have been feeding America for 24 years- “Bush Lied People Died”
GWBush himself failed to mount a vigorous defense of his own decisions and spent most of his second term meekly ducking and covering in noble silence under attack, encouraging and even feeding this whole meme that Saddam was no threat to us and that Bush's decision to go into Iraq TO ENFORCE UN MANDATES was fabricated for personal reasons
I believe Trump's views are wrong wrong wrong but I understand why he has them
I think once he is “read in” on national security issues and starts receiving classified information, it will change his views on a lot of things