The measure is facing a possible veto from Russia, Syria's ally, which wants to first see a report due on Thursday on a sarin gas attack in Khan Sheikhun before deciding on the fate of the inquiry.
"The Syrian Arab Republic is responsible for the release of sarin at Khan Sheikhoun on 4 April 2017", the report from the United Nations and the Organization for the Prohibition of Chemical Weapons' Joint Investigative Mechanism (JIM) said.
The United States accuses Russian Federation of linking the JIM's survival to its findings on the April 4 Khan Sheikhun attack.
The UN placed the death toll at 83 while the UK-based Syrian Observatory for Human Rights said it was 87.
Syria's continued use of chemical weapons and failure to destroy its chemical weapons program in its entirety are clear violations of Syria's obligations under the Chemical Weapons Convention and UN Security Council Resolution 2118.
Haley argued that the OPCW was reviewing more than 60 cases of alleged chemical weapons use in Syria, including a recently-uncovered sarin attack on an opposition-held village on March 30.
"This report and the one that preceded it are falsifications of the truth and distort the exact information on what happened at Khan Sheikhun".
Images and video from the incident, including dying children, caused outrage around the world, and eventually led to US President Donald Trump's "warning shot" barrage of 59 Tomahawk missiles on a nearby Syrian airbase - the only direct US intervention in Syria's civil war to date. The OPCW does not have a mandate to assign blame for the attacks, leaving that determination to the JIM.
The JIM has already found Syrian government forces were responsible for three chlorine gas attacks in 2014 and 2015.
The source asserted that Syria has cooperated with the UN-OPCW mechanism and did not delay or hesitate to work with them in various fields, including providing accurate information required to show the fact that the terrorist parties had used chemical weapons directly and indirectly and are supported by parties in the region and beyond, particularly the US, France, and Britain, and their tools in the region such as Saudi Arabia, Qatar, Turkey, and other countries.
The JIM was unanimously created by the 15-member U.N. Security Council in 2015 and renewed in 2016 for another year.