Bernie Sanders doubled down Sunday on his assertion that climate change contributes to international terrorism. Sanders made that point during Saturday's Democratic debate, and has argued it on the campaign trail.

"That's not only my observation. ... That is what the CIA and the Department of Defense tells us," Sanders told host John Dickerson on "Face The Nation." Dickerson was also the host of Saturday's debate.

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"It's pretty obvious, if we are going to see an increase in drought, flood, extreme weather disturbances as a result of climate change, what that means is that peoples all over the world are going to be fighting over limited natural resources," Sanders continued.

"If there is not enough water, if there is not enough land to grow your crops, then going to see migrations of people fighting over land that will sustain them. And that will lead to international conflicts," he said. "In Syria. ... When you have drought, when people can't grow their crops they're going to migrate into cities. When people migrate into cities they don't have jobs, there's going to be a lot more instability, a lot more unemployment and people will be subject to the types of propaganda that al Qaeda and ISIS are using right now."

Sanders has worked to court the environmental movement, but has faced setbacks. Rival Hillary Clinton won the League of Conservation Voters' endorsement last week.

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