Trump promised a big response and has consulted with his national security team and foreign leaders for days about whether, and how hard, to strike Assad.
Speaking to reporters in Romania, Le Drian says: "We are very firm.as the president of the Republic said. this situation can't be tolerated". In his tweet on Thursday, the president defended his warning a day earlier and appeared to try to reintroduce the element of surprise over a possible American missile strike, underscoring what critics have described as a confusing policy on United States involvement in Syria.
Russian military police has had a presence inside Douma this week as part of a deal with Jaish al-Islam, the Islamist group that controlled the area for years.
A medical worker gives a toddler oxygen through a respirator following an alleged poison gas attack in the opposition-held town of Douma, in eastern Ghouta, on Sunday. The president previously struck Assad for using Sarin gas against civilians in April 2017 and is publicly incensed at the regime's repeated action.
White House press secretary Sarah Huckabee Sanders later insisted no final decisions had been taken and that "all options are on the table".
The Organisation for for the Prohibition of Chemical Weapons had said it intends to send investigators to Douma to look for any evidence of a chemical attack.
Russian Federation has since aggressively threatened the United States if it were to fire any missiles at Syria in response to the chemical gas attacks.
Russian TV footage showed the Syrian government's red, white and black flag with two green stars hanging from an unidentified building, while cheering crowds waved flags surrounded by war-torn buildings.
Vladimir Shamanov, a retired general who heads the defense affairs committee in the lower house of parliament, said in televised remarks that a US strike in Syria could hurt Russian servicemen and trigger Russian retaliation.
He did not say whether France was planning military action.
"Why do we keep broadcasting when we are going to attack Syria".
At the time, Trump made it clear that the use of chemical weapons, especially against women and children, was an act of pure evil that demanded a military response.
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Vladislav Volodin, the speaker of Russia's lower house of parliament, said the "whole world is horrified by" Trump's tweeting.
Theresa May is holding an emergency cabinet meeting today to discuss Britain's response to the suspected chemical weapons attack on civilians in Syria.
Anchor: Attention is focused on whether the United States will take military action against Syria which is facing accusations of using chemical weapons on its own people.
US President Donald Trump had earlier warned regime-backer Russian Federation that "missiles will be coming' to Syria over the alleged attack in Douma that rescuers said killed 40 people".
Labour's Jeremy Corbyn, leader of the opposition, says that a vote is necessary and bombing could lead to a hot war between the USA and Russian Federation, which has promised to answer any strikes.
"It is worth noting, however, that even if military action is taken before MPs return from their Easter recess, May will nearly certainly have to explain her response to parliament and seek its approval for any longer-term engagement", he adds.
A World Health Organization statement Wednesday did not confirm outright that a chemical weapons attack had taken place.
But he added: "I am hoping there is a strategy which the government will tell us about [and] I am hoping that Donald Trump and his administration will talk to us about what strategy they have".