'I would raise $1 billion in one day' -Trump

"All I have to do is call up the head of every Wall Street firm, head of every major company, head of every major energy company," Trump said, adding while pretending to hold a telephone, "'Do me a favor, send me $10 million for my campaign.'"

The Republican president also imagined out loud calling the head of energy giant Exxon Mobil to ask for a $25 million campaign contribution in exchange for exploration permits.

"I don't want to do that," Trump added.