Abigail Disney, the heiress to the world-renowned entertainment firm, has endorsed the proposed wealth tax from Democratic presidential candidate Sen. Elizabeth Warren, slamming the wealthy people that are fighting the policy as "idiots."

Speaking to CNBC's Karen Tso Thursday, Disney criticized those opposing the proposal to protect their own fortunes.

"If you have a billion dollars and (you're worried you won't) make a hundred million dollars a year just by sitting on your couch at home, truthfully you're kind of an idiot," she said. "Money just makes money. It's one of the hardest things in the world not to let it grow."

She added it was "really important" to make the public aware that the ultra-wealthy would not have their spending power dented by Warren's taxation manifesto.

"If it's a 2% (or) 3% tax, it will in no way inhibit first of all, your buying power, and second of all, the growth of your buying power," Disney claimed. "So I don't understand what the hesitation is around a wealth tax, because it in no way encumbers a person who is already so far past being able to spend that money that could be so much better used."