He said his campaign encourages people to participate in the political process.
Paul said that coal could be "very valuable" with less government regulation.
Collins said Trump needs to "stop with the gratuitous personal insults."
The clip shows Cruz, Rubio, Romney, Fiorina and others tearing into the businessman.
"I am totally and completely looking forward to President Trump," said Rep. Candice Miller.
The campaign filed a lawsuit late Tuesday after a polling site opened more than an hour late.
Carson concedes that "people were very mean to each other" in the Republican primary.
Todd said that Donald Trump has "essentially remade the coalition of the Republican Party."
“I ran to the very end in 2008,” she said.
"I'm going to let people judge for themselves," she said, calling Trump a "loose cannon."