Sen. Tim KaineTimothy (Tim) Michael KaineBill to bolster gun background checks gains enough support to break filibuster Senators demand cyber deterrence strategy from Trump Two-year defense spending smooths the way to a ready military MORE (D-Va.) told CNN on Thursday that the president should not launch a military attack "unless they know that they’ve got the full weight of our political leadership behind them, and the American public supports the mission.” 

Sen. Rand PaulRandal (Rand) Howard PaulMichael Steele: Congress must lead on cannabis reform and stand with the American public Lawmakers renew call for end to 'black budget' secrecy McCain asks Trump's CIA pick to explain ties to torture MORE (R-Ky.) said the conflict in Syria "has no clear national security connection to the United States and victory by either side will not necessarily bring in to power people friendly to the United States" in a statement released Wednesday.

But other lawmakers have blasted the president for not doing more to intervene.

Sen. John McCainJohn Sidney McCainMcCain asks Trump's CIA pick to explain ties to torture Petraeus: Haspel will explain actions in nomination hearing Afghanistan is our longest war ever and Congress has abandoned all responsibility MORE (R-Ariz.) has said the type of limited military strike reportedly under consideration by the Obama administration wouldn't do enough to deter Assad from using chemical weapons again.

“They might do a strike and say, ‘See we punished them,’ but it won’t change the equation. I would expect Assad to continue to use these weapons,” McCain told The Daily Beast. “And other Assads around the world will now not hesitate to use these weapons and sooner or later they may be used against Americans.”