These are the very same weapons of mass destruction that were in Iraq before the 2003 invasion, that couldn’t be found in Iraq, because they had been sent to Syria: https://blog.usni.org/2012/07/20/iraq-chemical-weapons-moved-to-syria-before-2003-invasion.
That is the Left-Wing Collective Amnesia About the Iraq War: you pretend to forget that Saddam Hussein ever had weapons of Mass Destruction, and that Democrats and Republicans both voted for the invasion. Trump’s act is quite different anyway: he sent a message that it is not OK to nerve gas children on his watch as it was on Obama’s. It was a limited, proportional response, not an invasion. Saying it is a repeat of the Iraq war is an insult to our intelligence, and an indictment of yours.