"We are rapidly reaching that understanding", she said.
Cafarella said the United States must decide how far it wants to go in terms of hitting Iranian proxy forces near U.S. positions in eastern Syria, or even targeting Russian-supported facilities.
The Syrian government has denied responsibility for the alleged chemical weapons attack on Saturday on the town of Douma where rebels have been holding out against a prolonged siege by pro-Assad forces.
Mr Trump's decision to announce in highly inflammatory language on Twitter that missile strikes are imminent, rather than retaining an element of surprise, raised eyebrows among military chiefs.
"Get ready, Russia, because they will be coming, nice and new and "smart"".
Defense Secretary Jim Mattis, however, indicated that evidence of what happened was still being studied. If the US' goal is to intimidate Russian Federation, then Washington will fail, the senator said.
"There's a lot we know" about Assad's air defenses, said Chollet.
Syrian government forces have regained full control of the city as the worldwide community considers its response.
Trump responded then by launching dozens of Navy cruise missiles at a Syrian airfield.
Since Trump's warning, the Syrian military has moved assets around in an attempt to shield them from U.S. missiles, possibly by putting them under Russian protection.
Justice Department inspector general says McCabe repeatedly mislead
DOJ says it was taking its lead from the FBI's Office of Professional Responsibility recommending McCabe be sacked. McCabe previously drew attention for his misbehavior regarding the investigation into Hillary Clinton's emails.
In the past, Trump has condemned others for forecasting military plans, repeatedly blistering President Barack Obama during the 2016 campaign.
During tensions with North Korea in April of 2017, he said in an interview on "Fox & Friends" that he would not say whether he would order a strike if the rogue nation continued conducting missile tests. We are totally predictable. "He may, and if he does, it's going to be very tough, very tough", Trump said on Monday.
Just a week ago, he talked about withdrawing USA troops from the country, but that's neither here nor there. Russian officials have also threatened unspecified repercussions if the us and its allies carry out their plans to attack Syria. In his next tweet the American president stated that American-Russian relations are now the worst in history and also suggested Russia should stop the arms race. He declared that USA relations with Russian Federation have plunged to a historic low.
Syria's Foreign Ministry said Wednesday that Trump's threats to attack are "reckless" and endanger global peace and security.
Donald Trump has also threatened military action.
Assad's Damascus regime, which has long accused Washington of supporting its armed opponents in the country's bloody seven-year-old civil war, hit back at Trump's "reckless escalation".
If any Russians are killed in USA reprisals for Saturday's attack, Moscow could step up harassment of US warplanes and outposts in the region, former officials say. In the past two months, the US' NATO allies Turkey have invaded northern Syria to crush the independent Kurdish city of Afrin, a centre of activity by the Syrian Kurdish People's Protection Units (YPG).
Trump a year ago ordered a strike against Assad following a deadly sarin gas attack on the rebel-held town of Khan Sheikhun.
The French president does not need parliamentary permission to launch a military operation. The U.S. has about 2,000 troops deployed chiefly in the country's north, where they support Kurdish troops fighting Islamic State.