U.S. Defense Secretary Jim Mattis announced Thursday that his country wants to avoid an “out of control” situation in the event of any military strike on Syria over the suspected Douma chemical attack.

 

At a congressional hearing on the Pentagon's 2019 budget request, Mattis declined to discuss military plans but said legislative leaders would be notified before any attack was undertaken. He said that because the U.S. had no one at the site of the suspected chemical attack last Saturday, the U.S. has no hard evidence of what happened. But he said he personally believes it was an "inexcusable" use of chemical weapons.

 

Asked about the risks of U.S. military retaliation, Mattis cited two concerns, starting with avoiding civilian casualties.

 

"On a strategic level, it's how do we keep this from escalating out of control, if you get my drift on that," he said.

 

Mattis insisted that Trump has not yet made a decision to strike Syria, after the president earlier had tweeted that action "could be very soon or not so soon at all!"

 

The Pentagon chief and other top security officials were due to head to the National Security Council after the hearing, where he said he would "take forward the various options to the president."

 

At stake in Syria is the potential for confrontation, if not outright conflict, between the U.S. and Russia, former Cold War foes whose relations have deteriorated in recent years over Moscow's intervention in Ukraine, its interference in the 2016 U.S. presidential election and, most recently, its support for Syrian President Bashar al-Assad.

 

Russian lawmakers have warned the United States that Moscow would view an airstrike on Syria as a war crime and that it could trigger a direct U.S.-Russian military clash. Russia's ambassador to Lebanon said any missiles fired at Syria would be shot down and the launching sites targeted -- a stark warning of a potential major confrontation.

 

Trump, who has often said a commander in chief should never telegraph his military intentions, apparently did so himself, tweeting that missiles "will be coming" in response to the suspected chemical attack that killed at least 40 people near Damascus.

 

"Russia vows to shoot down any and all missiles fired at Syria," Trump wrote. "Get ready Russia, because they will be coming, nice and new and 'smart!' You shouldn't be partners with a Gas Killing Animal who kills his people and enjoys it!"

 

Mattis, however, indicated that evidence of what happened was still being studied. At a photo-taking session during a Pentagon meeting with his Dutch counterpart, Mattis was asked by a reporter whether he had seen enough evidence to blame the Syrian government.

 

"We're still assessing the intelligence, ourselves and our allies," Mattis said. "We're still working on this."

 

Trump suggested Monday he had little doubt that Syria was to blame, but neither he nor other administration officials have produced hard evidence. This is in contrast to an incident one year ago in which the U.S. government had video and other evidence of certain aspects of an actual attack by Syrian aircraft, which involved the use of sarin gas. Trump responded then by launching dozens of Navy cruise missiles at a Syrian airfield.

 

Asked whether the U.S. military was ready to conduct an attack in Syria if ordered, Mattis replied, "We stand ready to provide military options if they're appropriate, as the president determined."

 

In the past, Trump has condemned others for forecasting military plans, repeatedly blistering President Barack Obama during the 2016 campaign. During one speech, he said, "We must as a nation be more unpredictable. We are totally predictable. We tell everything."

 

The U.S., France and Britain have been in extensive consultations about launching a military strike as early as the end of this week, U.S. officials have said. A joint military operation, possibly with France rather than the U.S. in the lead, could send a message of international unity about enforcing the prohibitions on chemical weapons and counter Syria's political and military support from Russia and Iran.

 

French President Emmanuel Macron said Thursday that France has proof that the Syrian government launched chlorine gas attacks and that France would not tolerate "regimes that think everything is permitted."

 

The Syrian government denies responsibility.

 

The French president does not need parliamentary permission to launch a military operation. France is already involved in the U.S.-led coalition created in 2014 to fight the Islamic State group in Syria and Iraq. Multiple IS terror attacks have targeted France, including one last month.