The chairman of the Senate Foreign Relations Committee said Russia has an obligation to denounce Syrian leader Bashar Assad for using a deadly gas on civilians.

“Russia has got to take responsibility for the fact that they are supporting this brutal monster, which is what he is,” Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) said Thursday on CNN’s “New Day." "We need to put this guy in jail.”

“[Assad] needs to be behind bars. We need to have him before a tribunal.”

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“Hopefully there’s enough evidence to get the world community behind that effort. And hopefully we’ll develop a way to send a signal to this person.”

Military forces loyal to Assad are suspected of conducting a deadly gas attack Tuesday that killed 72 people, including 20 children. The strike on the rebel-held Idlib Province is being described as the worst chemical weapons strike in Syria in years.

President Trump on Wednesday signaled a more aggressive approach to Syria after the attack, saying it might have changed his attitude about Assad.

“It crossed a lot of lines for me,” Trump said at the White House. "I will tell you, what happened yesterday is unacceptable to me.”

“When you kill innocent children, innocent babies, little babies with a chemical gas that is so lethal that people were shocked to hear what gas it was, that crosses many lines beyond the red line. Many, many lines.”

Secretary of State Rex Tillerson said Wednesday the Russian government needs to “think carefully about their continued support of the Assad regime” following the attack.