President Trump on Thursday pushed back at critics who accused him of telegraphing a US strike on Syria and wondered when the world would thank the USA for routing ISIS.
White House press secretary Sarah Huckabee Sanders says Vice President Mike Pence chaired the meeting Wednesday afternoon.
Trump is facing criticism for sending conflicting signals on his Syria policy.
And the Prime Minister is believed to be willing to support taking action against Syria without seeking the consent of parliament.
United States diplomats and military leaders have pushed back, and publicly, indicating much needed to be done.
The Pentagon is likely planning a larger strike than what USA warships launched on April 7, 2017, in response to the Assad regime's use of chemical weapons, said a former senior Defense official familiar with planning for that attack.
Meanwhile the UN Security Council met again yesterday, at Russia's request, to try to defuse the standoff.
"Any delay in visiting the location of the alleged incident could lead to another reckless move of Washington, which already fired missiles on Syria's Shayrat airbase in April 2017 in violation of the United Nations charter and worldwide law", the ministry said in a statement.
The majority of those forces are in the northeast part of the country, where the USA has set up a number of temporary bases.
Nikki Haley told an emergency meeting of the UN Security Council called by Russian Federation that should the U.S. and its allies decide to act in Syria it will be to defend "a bedrock global norm that benefits all nations" - the prohibition on the use of chemical weapons.
German Chancellor Angela Merkel on Thursday said her country would not participate in any possible military action against Syria.
Macron did not say what the evidence is; however, he stressed France is in daily contact with the Trump administration and that they will respond "at a time of our choosing, when we judge it to be the most useful and the most effective".