Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezWhy Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' House Democrats postpone vote on marijuana decriminalization bill MORE (D-N.Y.) on Thursday fired back at former Sen. Joe Lieberman (I-Conn.), who said he hopes she is not the future of the Democratic Party.

Ocasio-Cortez fired back in a tweet asking, “New party, who dis?”

Lieberman, a former Democrat who was the party's vice presidential nominee in the 2000 election, argued that the New York progressive should not be the center of the modern Democratic Party.

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“With all respect, I certainly hope she’s not the future and I don’t believe she is," Lieberman said told host Neil Cavuto on Fox Business News.

"She's gotten a lot of attention because she's different. She's controversial," Lieberman continued. "But 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. And that is because they had to be center-left to win some of those competitive swing districts that they took from Republicans."

Ocasio-Cortez made national headlines last year when she defeated Rep. Joseph Crowley (D-N.Y.), a 10-term incumbent and former chairman of the House Democratic Caucus, in the primary for New York’s 14th Congressional District.

The 29-year-old self-identified democratic socialist became the youngest woman ever elected to the House in November.

She often hits back to criticism on her social media accounts and roiled conservatives earlier this month when she floated the idea of higher tax rates on the wealthiest Americans to fund a "Green New Deal" as an aggressive response to climate change.