Graham Challenges Trump to Follow Through on Threat Against Syria: ‘This Is a Defining Moment, Mr. President’

Sen. Lindsey Graham (R., S.C.) challenged President Donald Trump Sunday to follow through on his threat against Syrian dictator Bashar al-Assad for reportedly using chemical weapons against his own people again.

In response to a reported attack in a Damascus suburb that has left dozens dead, Trump tweeted Sunday there would be a "big price to pay."

Graham told ABC's Martha Raddatz that not acting could negatively hurt Trump's attempts to have North Korea denuclearize. Graham also blasted former President Barack Obama for not taking the appropriate action in Syria during his presidency.

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"It's a defining moment in his presidency because he has challenged Assad in the past to not use chemical weapons," Graham said. "We had a one and done missile attack, so Assad's at it again. They see us, our resolve breaking, they see our determination to stay in Syria waning, and it's no accident they used chemical weapons but President Trump can reset the table here."

Graham said he would destroy Assad's air force and create safe zones in the country where refugees could return to Syria and live peacefully.

"If it becomes a tweet without meaning, then he's hurt himself on North Korea. If he doesn't follow through and live up to that tweet, he's going to look weak in the eyes of Russia and Iran," Graham said. "So this is a defining moment, Mr. President, you need to follow through with that tweet, show a resolve that Obama never did to get this right."