When asked if the US military was ready to conduct retaliatory strikes against Syria, Mattis replied that officials "stand ready to provide military options if they're appropriate as the president determines".
In a statement summarizing the meeting, Pentagon officials said Mattis highlighted the value of the Netherlands to the United States and North Atlantic Treaty Organisation as a steadfast ally and its pledge to get to increase defense spending to 2 percent of its gross domestic product.
"Many dead, including women and children, in mindless CHEMICAL attack in Syria", Trump wrote on Twitter on Sunday. Prime Minister Theresa May said that "all the indications" are that chemical weapons were used by Bashar's forces.
"Russia vows to shoot down any and all missiles fired at Syria", the President tweeted.
Trump tells Russian Federation to 'get ready' for Syria missile strikes
Russian Federation is Syrian President Bashar al-Assad's most powerful ally in the years-long civil war against rebel groups. The attack contemplated by the Trump administration would be "symbolic" and created to "send a message", Barbero said.
His statement followed Mr Trump's warning for Russian Federation to "get ready" because missiles "will be coming". As a result of this attack at least 70 people died. The Pentagon chief said he would not rule out a USA military strike against Syria in response to a suspected poison gas. "We're still working on this", Mattis told the media on Wednesday in Washington.
When asked by reporters at the formal meeting if he could confirm the Assad regime had used chemical weapons over the weekend, Mattis shook his head no.
The United States last April launched 59 cruise missiles at a Syrian airfield in response to a similar chemical attack by the government that killed dozens of civilians.
On Monday, the Russian Defense Ministry claimed that Israel bombed a Syrian military base in response to the chemical attacks. Another humanitarian disaster for no reason whatsoever.