'New party, who dis?': Alexandria Ocasio-Cortez mocks Joe Lieberman after he said she wasn't future

WASHINGTON – Alexandria Ocasio-Cortez, the 29-year-old Congress freshman from New York, clapped back at longtime Democrat turned Independent Joe Lieberman after he said she wasn't the future of the party.

"New party, who dis?" Ocasio-Cortez wrote on Twitter in response to Lieberman's criticism.

Lieberman, a former vice presidential candidate who ran with Democrat Al Gore in the 2000 election, talked about Ocasio-Cortez and her progressive ideas, including up to a 70 percent tax rate on the nation's wealthiest to fund a green energy plan, in an interview on Fox Business on Thursday.

"I certainly hope she's not the future and I don't believe she is," he said, adding he thought she was too far left to be a symbol of what the Democratic party would be in the future or even when it comes to nominating a presidential candidate in 2020.

"If you look at the majority of new Democrats in the House, they tend to be, I say, center-left, if they are not left-left,” he said. “And that is because they had to be center-left to win some of those competitive swing districts that they took from Republicans."

More: Alexandria Ocasio-Cortez claps back to dancing 'controversy' with new video

More: Alexandria Ocasio-Cortez embraces 'radical' label, says 'no question' Trump is racist

Ocasio-Cortez has consistently fended off criticism on her social media pages, taking down critics and right-wing trolls with her responses that have included both jokes and emojis.

After a clip of Ocasio-Cortez, the youngest woman ever elected to Congress, dancing went viral last week and caught the attention of conservatives, she responded with another video of her dancing outside her new congressional office.

The video became the most retweeted tweet in just five hours for Ocasio-Cortez, who is known for her viral posts and savvy social media presence.

Ocasio-Cortez upset veteran Democrat U.S. Rep. Joe Crowley in her June primary and has become a leading voice for many progressives since, advocating for a "Green New Deal," abolishing ICE and Medicare for all.

More: On her first day of orientation on Capitol Hill, Alexandria Ocasio-Cortez protests in Pelosi's office

More: Ocasio-Cortez decries congressional pay, vows to give interns 'at least' $15 an hour

This article originally appeared on USA TODAY: 'New party, who dis?': Alexandria Ocasio-Cortez mocks Joe Lieberman after he said she wasn't future