In Iowa, Democratic presidential candidates Bernie Sanders, Hillary Clinton and Martin O’Malley faced off at a CNN-hosted town hall Monday. The most recent poll by CNN shows Sanders leading Clinton by two points with the Iowa caucus less than a week away, although Clinton retains her lead in national polls. At the town hall, Sanders drew applause when he said he had been opposed to the Keystone XL pipeline since day one.

Sen. Bernie Sanders: “In terms of climate change, which everybody here knows, and apparently everybody in the world knows except Republican candidates for president, is one of the great environmental crises facing this nation, on day one I said the Keystone pipeline is a dumb idea. I think the Bakken pipeline and pipelines in Vermont and New Hampshire are a dumb ideas. We’ve got to break our dependence on fossil fuel. Why did it take—why did it take Hillary Clinton such a long time before she came into opposition to the Keystone pipeline?”

Sanders also criticized Clinton for voting for the Iraq War and for being absent on the fight against Wall Street deregulation.