The problem with your premise is that it's out of context of Trump at the time of the war was a Dem, so he listened to false narratives that said WMD did not exist, which is a false subjective word game spin by the Dems and MSM which he was a viewer of at the time.
FACT: WE FOUND THE CHEM WEAPONS IN SYRIA which is what the intelligence community knew they were smuggled to the neighboring country.
Obama and MSM covered this up by stating it was Syria's chem weapons that time he gave them an ultimatum to destroy (the evidence), but it wasn't all Syrias, most was Iraqs smuggled into Syria, just politicsl word play, yes now they were Now Syrias, but where did they come from-Doh!
Fact: Iraq had tons of chem weapon antidotes that we found, there is no reason to have that if wmd chem weapons didn't exist-Doh!
Subjective? How much chem weapons till you consider it mass weapons¿
= Political spin word games.
Trump being a Dem fell for it not yet knowing about fake news or how seriously dimented and pathological his fellow collegues (some being politicians ) were .
That is a lie.
We did NOT find any WMD in Syria.
The UN asked Syria to turn over any WMD they had, after the rebel chlorine gas collection blew up.
Syria then turned over some sarin, and that is it.
{...
Transparent cooperation
Two OPCW deployments took place in March and April, with inspectors visiting a dozen sites in and around Damascus, including key facilities of the Scientific Studies and Research Centre (SSRC) – long believed to be central to Syria’s weapons programme.
During the April visit, samples were collected for laboratory analysis and experts met with newly appointed Syrian officials, including the new Director-General of the SSRC.
“For both deployments, the
interim Syrian authorities extended all necessary support for the OPCW team’s activities,” Ms. Nakamitsu said, noting that this included full access to sites and personnel, security escorts and issuance of visas.
“The commitment of the new authorities in Syria to fully and transparently cooperate with the OPCW Technical Secretariat is commendable.”
...}
Sarin has a short shelf life.
So none of it could have come from Iraq.
The theory Saddam hid his chemical weapons in Syria, clearly is a lie.
And there is no evidence Syria ever used chemical weapons.
They make no sense.
They are much less lethal and more expensive than plain explosives.
Any one trying to bring up WMD in general is just trying to incite propaganda.