The Obama administration spent Labor Day trying to convince Congress and the world that Syria should pay for allegedly using chemical weapons on civilians.
Lawmakers are still in summer recess, but many returned to the nation's Capital for classified briefings that could trigger missile strikes on Syria.
President Barack Obama is looking to rally lawmakers behind the idea of U.S. Military action against Syria.
On Sunday, dozens of lawmakers attended a closed door briefing to get a look at the evidence against Syrian President Bashar Assad. Some were not convinced, while others remain skeptical.
"The concerns among members of Congress, including myself is there, one, be multi-lateral support for that, that the U.S. is not going it alone so to speak," Senator John Thune said.
Russia is urging the US not to strike Syria. America's closest ally, Great Britain already voted down the use of military force.
The reports of the Syrian regime launching a massive chemical attack on civilians, killing at least 281 people and could carry out similar strikes in the future, is troubling. But Congresswoman Kristi Noem believes chemicals were used.
"I think the evidence has proven and revealed to me through the reports I've heard and conference calls I've been apart of, I believe the evidence is clear, they were used by the Syrian government," Congresswoman Kristi Noem said.
Both Noem and Thune are concerned about the President's plan to launch missile strikes on Syria.
"I think there are consequences for firing a strike on Syria, even though it's intended to hit just the facilities that contain weapons of mass destruction, it's my understanding that they be being moved to civilian areas, which means we could have potential ramifications with what's at stake that and casualties," Noem said. "It's become very complicated and convoluted and and need to make sure our number one objective is America and keeping our national security the number one priority and look at this and we need a better plan from the President."
"I think it's really important that we not rush into this, that there be ample time to provide members of Congress with an explanation and to the American people for whatever action the administration decides to pursue," Thune said.
Senator Tim Johnson issued this statement on Syria. "The President is right to ask for congressional approval before he takes military action in Syria. There needs to be a full and open debate before the United States commits to further military action in the Middle East."
A vote authorizing military action in Syria is not expected until sometime next week.