OMAHA, Nebraska — Hillary Clinton threw her support behind the "Buffett Rule," a proposal which would require millionaires to pay 30 percent in taxes, but pledged to go "even further" to ensure that the wealthiest Americans are shouldering more of the tax burden at a rally here Wednesday.
Clinton was introduced and endorsed by billionaire Warren Buffett in his hometown. Buffett, who often talks about how he pays a lower tax rate than his secretary, spurred President Barack Obama to introduce the "Buffett Rule" in 2011 but it has yet to be enacted.
"He's never lost sight of what made this country great," Clinton said of Buffett. "He understands … that we're out of balance. The deck is stacked in favor of those at the top. We need to reshuffle that deck."
After praising Clinton for talking about raising incomes and criticizing Republicans for not doing so, Buffett said, "America should work for those who are willing to work. You should be able -- in a country this rich -- to take care of a family working a 40-hour week."
Clinton, who said she wanted "to be the president for the struggling, the striving and the successful," will roll out her full tax plan early next year, a campaign aide confirmed.
So far, Clinton has proposed spending plans on college affordability, infrastructure and early childhood education but promises to pay for those initiatives without taxing families earning less than $250,000 a year.
Though she did not mention the Republican debate, held Tuesday night, Clinton did not hesitate to hit GOP candidates on both gun control and anti-Muslim rhetoric.
And she also took aim at Donald Trump's campaign slogan, as she has in recent months. "I think America is great and it's up to us to make sure we make it greater," she said.
This article originally appeared on NBCNews.com.