Presumptive GOP nominee Donald Trump continues to tout his support for increasing the number coal jobs without sharing details on how he would fulfill the promise as president.

“We’re going to get those miners back to work,” Trump said at a rally in West Virginia. “The miners of West Virginia and Pennsylvania, which was so great to me last week, Ohio and all over are going to start to work again, believe me. They are going to be proud again to be miners.”

He also vowed, “we’re going to have clean coal and we’re going to have plenty of it. We’re going to have great, clean coal. We’re going to have an amazing mining business.”

“You know, you aren’t allowed to use hairspray anymore because it affects the ozone,” Trump joked after accepting an honorary hardhat. “Hairspray’s not like it used to be. It used to be real good.”