Washington (CNN) Some House Democrats have been unhappy with progressive Rep. Alexandria Ocasio-Cortez's resistance to falling in line with her fellow party members, particularly her threats to support primary challenges against incumbents, Politico reported Friday.

Lawmakers have been quietly criticizing the New York newcomer and are hoping to rein in her criticism of those in her own party, Politico reported, citing nearly 20 lawmakers and aides. The report described lawmakers as fearful of Ocasio-Cortez's ability to swing progressives against more establishment Democrats and anxious to utilize her influence to unite the party.

They point to her hiring of two former organizers from the progressive group Justice Democrats, which helped get her elected, and a November conference call in which she urged, "all Americans know money in politics is a huge problem, but unfortunately the way that we fix it is by demanding that our incumbents give it up or by running fierce campaigns ourselves."

Through her staff, Ocasio-Cortez declined to comment to Politico. But after the story published, she responding to the report on Twitter Friday , writing, "To quote Alan Moore: 'None of you understand. I'm not locked up in here with YOU. You're locked up in here with ME.'"

Democratic leaders were also frustrated that Ocasio-Cortez criticized their new set of House rules on Twitter in the first week of the new Congress, Politico reported. Ocasio-Cortez shared with her more than 2 million Twitter followers that she'd vote against a Democratic rules package.

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