Senate candidate John Fetterman, D-Pa., previously signed pledges to ban fracking in Pennsylvania and new fossil fuel leasing nationwide.

Fetterman, Pennsylvania's current lieutenant governor, agreed to co-sponsor the Keep It In The Ground Act — federal legislation banning new oil, gas and coal leasing on federal lands — and support a complete moratorium on fracking in Pennsylvania, according to an April 2016 Facebook post from Pennsylvania Voters Against Fracking. 

The social media post included a picture of Fetterman signing the pledge and a separate picture of his signature on the document.

The pledge had been organized by Food & Water Watch, a left-wing climate group, amid the 2016 election in which Fetterman unsuccessfully ran for Senate.

"I'm not pro-fracking and have stated that if we did things right in this state, we wouldn't have fracking," Fetterman wrote in a Reddit post during the 2016 Senate race. "The industry is a stain on our state and natural resources."