WATCH: Donald Trump Attacks Hillary During Massive Rally in Charleston, West Virginia

"How about Hillary Clinton? I was watching her three or four weeks ago." Trump said as the crowd booed. Trump was referencing an earlier statement by Clinton saying, "We're going to put a lot of coal miners and coal companies out of business."

Trump said she wants to put miners out of work, but he wants to get them back to work.

"West Virginia Coal Association just endorsed me. Lets put it this way, it was between me and Hillary and we really affectionally call her crooked Hillary," Trump said, commenting on his recent endorsement. "And you know, how long they said they were in the room, about twenty seconds, that's how long it took."

"I've just always been fascinated by the mines," the real estate mogul said, adding he's also fascinated by the courage of miners and how they love what they do. "If I win, we're going to bring those miners back. You're going to be so proud of your president."