Senators said it was improbable that a new Authorization for Use of Military Force could be completed before Trump might take immediate action against Syria but that if it turns into a lengthy conflict a new authorization might be needed to approve the deployment.
Trump said the U.S.is still investigating the possible involvement of the Iranian and Russian governments in the strike.
"On the eve of potential USA and French strikes against Assad in response to the Douma gas attack, it is likely the Israelis already had the intention to strike at the T-4 base, and timed their attack to maximise the destruction they could inflict on Iranian forces", he told AFP. "Everybody's gonna pay a price".
"We are studying that situation extremely closely, we are meeting with our military and everybody else and we are making some major decisions over the next 24-48 hours", he told reporters and his cabinet.
Trump's comments are his first public remarks on the attack, which killed dozens of civilians, since he tweeted about it on Sunday and warned of a "big price to pay" for those responsible.
Lord Hague, who was foreign secretary when then prime minister David Cameron lost a Commons vote he wanted to back action in Syria, said the aftermath of the defeat left the United Kingdom "enfeebled spectators of one of the most destructive conflagrations of our time".
The United States, backed by Britain and France, has said it is ready to act with or without support from the United Nations, where the Security Council was to vote as early as Tuesday on rival U.S. and Russian proposals to probe chemical attacks in Syria.
President Trump has called the suspected chlorine gas attack "barbaric", referencing images of sick, suffocating and dying children. He also wants a long-term plan to topple the regime of Syrian President Bashar al-Assad.
Washington's main European allies stood by reports blaming Assad.
But Hurd said if differences over Syria lead to a direct military battle between Russia and the United States, Russia would not fare well.
The council met publicly on Monday over the latest suspected chemical weapons attack.
"It's time to come back home and we're thinking about that very seriously", Trump said on April 3.
The strike was carefully limited - 59 U.S. Tomahawk cruise missiles that damaged about 20 Syrian aircraft or 20% of its operational warplanes.
Initially pointing the finger at Washington, state news agency SANA said the missiles had hit the T-4 airbase in central Syria.
As U.S. officials consider whether and how to respond, they are looking at what type of chemical agent was used.
Israel's Ministry of Foreign Affairs responded Monday evening to the alleged chemical attack in eastern Ghouta, saying it strongly condemns the attack and accused the Syrian government of "crimes against humanity".
In the aftermath of the chemical weapons attacks, however, Trump has used a decidedly different tone, lashing out at Iran and Russian Federation for supporting "Animal Assad" and hinting at a "big price" that will be paid.
Trump - who past year launched a missile strike on a Syrian air base after sarin was used in the town of Khan Sheikhun - warned after the latest accusations that there would be a "big price to pay".
Workers said more than 500 people, mostly women and children, were brought to medical centers.
Sanders is reiterating that Russian Federation and Iran "also bear responsibility for these acts". Another humanitarian disaster for no reason whatsoever.
Republican Sen. John McCain of Arizona said Assad heard Trump's signal that he wanted to withdraw from Syria and, "emboldened by American inaction", launched the attack.
After President Donald Trump warned on Monday that there would be a "big price to pay" for the suspected attack over the weekend, the United States circulated to the 15-member council a revised draft resolution to establish an worldwide inquiry, which it initially suggested on 1 March.
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