Marco Rubio and Ben Cardin are introducing legislation that details the Senate's position on the chemical weapons attack in Syria earlier this week: that Syrian President Assad, Russian President Putin, and others involved must be held accountable as war criminals. Cardin said the legislation also proposes additional sanctions on Russia.

Cardin called out Putin for facilitating the chemical weapons attack: "Mr. Putin...has clearly been facilitating the activities by President Assad…he needs to be investigated for culpability as a war criminal."

Russia is opposing a UN Security Council Resolution condemning the attack, which is backed by the U.S., France, and Britain. Russia says the resolution is based on "fake information." Rubio called Russia's resistance "fake news at its highest."