Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) asserted on Wednesday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE "has no legal authority" to deepen U.S. military involvement in Syria, and that it is ultimately up to Congress to make that decision.

"President Trump has no legal authority for broadening the war in Syria," Sanders said in a statement. "It is Congress, not the president, who determines whether our country goes to war, and Congress must not abdicate that responsibility.

"If President Trump believes that expanding the war in Syria will bring stability to the region and protect American interests, he should come to Congress with his ideas."

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Sanders's comments came as Trump weighs a potential military response to a suspected chemical weapons attack on the Damascus suburb of Douma over the weekend that left dozens of people dead.

The U.S. has blamed that chemical strike on the government of Syrian President Bashar Assad. Trump said on Monday that he would make a determination on a response within 48 hours.

The New York Times reported Tuesday that the president and his advisers are weighing a more aggressive strike than a missile attack on a Syrian air base launched in April 2017 in response to another chemical strike that killed more than 80 civilians.

The 2017 missile strike on Shayrat Air Base caused only modest damage, and administration officials worry that a similar attack would not adequately deter Assad's government from using chemical weapons, the Times reported.

But Trump has also spoken recently about his desire for an early U.S. withdrawal from Syria.

"I want to get out. I want to bring our troops back home," Trump said during a meeting with Baltic leaders at the White House earlier this month.

A number of lawmakers have demanded in recent days that Trump seek congressional approval for a retaliatory strike on Syria.

Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) said on Monday that the U.S. should respond to the suspected chemical attack in Douma, but said that "if that response is going to include military force, the president of the United States should come to Congress and ask for authorization before military force is used."

But not all lawmakers think that congressional authorization for a strike in Syria is necessary. Rep. Adam Kinzinger Adam Daniel KinzingerFox News reporter defends confirming Atlantic piece despite Trump backlash: 'I feel very confident' GOP lawmaker defends Fox reporter after Trump calls for her firing Lindsey Graham: 'QAnon is bats--- crazy' MORE (R-Ill.) said Tuesday that he believes Trump has the authority to act on his own, at least in a limited capacity.

"I think on something that’s limited like this he has the authority to act, especially on an issue like enforcing the nonuse of chemical weapons," Kinzinger said on CNN's "New Day."