"Why do we keep broadcasting when we are going to attack Syria".
Trump's new tweet seemed to backtrack from the bellicose one of Wednesday in which he suggested to Syria and its ally Russian Federation that a United States attack over the alleged chemical weapons assault on civilians last weekend was all but imminent.
Trump tweeted that Russian Federation made a "vow" to shoot down "any and all" US missiles targeting Syria.
She says there have been no decisions yet on whether to strike Syria despite the president's tweet Wednesday morning threatening to fire "nice and new and 'smart!'" missiles.
Defense Secretary Mattis, however, indicated that evidence of what happened was still being studied.
Theresa May will set out the evidence that she believes shows the Syrian government was responsible, and she will set out the military options being considered with USA and French allies. "We're still working on this".
"We are not surprised by such a thoughtless escalation by a regime like the United States regime, which sponsored terrorism in Syria and still does", the state news agency SANA cited an official source in the ministry as saying.
May has not confirmed whether the United Kingdom government is considering military action.
"We stand ready to provide military options if they are appropriate as the President determined", he said.
But in tweeting about a potential attack, Trump appeared to publicly telegraph military plans - something for which he heavily criticized former President Barack Obama back in 2013.
"Don't discount the possibility of Tomahawk-capable submarines in the region", Kirby said. We are totally predictable.
Regarding US claims on Russian Federation and Iran's support for Syria in this case he said "we have already warned that the United States intends to make such allegations, exactly like what happened in eastern Ghouta".
Vice President Mike Pence laughs as U.S. President Donald Trump holds a baseball bat as they attend a Made in America product showcase event at the White House in Washington, U.S., July 17, 2017.
Meanwhile, Syrians are bracing for a possible USA attack in retaliation to an alleged chemical assault that killed dozens on Saturday in Douma.
The recapture of Douma, in the region of Eastern Ghouta on the outskirts of Damascus, effectively represents the end of the war between Syrian President Bashar al-Assad and the rebel groups opposing his rule.
Shortly after his tweeted warning to Russia, Trump took a more conciliatory tone in lamenting that the US-Russia relationship "is worse now than it has ever been". "If it's Russian Federation, if it's Syria, if it's Iran, if it's all of them together, we'll figure it out and we'll know the answers quite soon", he pledged Monday.
Russian Federation and Syria quickly responded to Trump's threat on Wednesday.
"Russia's not spoiling in any sense for a military conflict", he continued, adding that Russian President Vladimir Putin was "ruthlessly rational in weighting cost-benefits".
There is no guarantee lawmakers would rubber-stamp a decision for military strikes. The Syrian government and Russian Federation have denied a chemical attack occurred.
This was then followed by the suspected chemical weapons attack that left a reported 70 people dead and 500 more injured at the weekend.
In response, Russia's foreign ministry said: "Smart missiles should fly towards terrorists, not towards the lawful government".