Liberal think tank accuses Bernie Sanders of trying to 'muzzle' journalists

A liberal think tank said Sunday that Sen. Bernie SandersBernie SandersRahm Emanuel: Bloomberg, Patrick entering race will allow Democrats to have 'ideas primary' Feehery: Pivoting to infrastructure could help heal post-impeachment wounds Jayapal hits back at Biden on marijuana 'prohibition' MORE (I-Vt.) is trying to "muzzle" its journalists after the 2020 presidential candidate said the group was "using its resources to smear" him and other Democratic candidates.

"The Center for American Progress is a research institution focused on ideas and policy. ThinkProgress is part of CAP Action: It is editorially independent of both CAP and CAP Action and has been for years. We do not suggest, edit, approve or see their stories before publishing. And, in this particular instance, no one at CAP or CAP Action knew about this article or video’s existence before publication," the Center for American Progress (CAP) said in a statement.

"Indeed, ThinkProgress publishes articles with which we disagree. We cannot and will not muzzle ThinkProgress, an editorially independent journalistic enterprise, and we believe it’s wrong for any political leader to demand it do so."

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Sanders wrote in a letter to CAP on Saturday that the group has unfairly criticized him, Sen. Elizabeth WarrenElizabeth Ann WarrenRahm Emanuel: Bloomberg, Patrick entering race will allow Democrats to have 'ideas primary' Feehery: Pivoting to infrastructure could help heal post-impeachment wounds Jayapal hits back at Biden on marijuana 'prohibition' MORE (D-Mass.) and Sen. Cory BookerCory Anthony BookerJayapal hits back at Biden on marijuana 'prohibition' Poll: Biden holds 20-point lead in South Carolina Fox News anchor apologizes for saying Booker dropped out of 2020 race MORE (D-N.J.).

“I and other Democratic candidates are running campaigns based on principles and ideas and not engaging in mudslinging or personal attacks on each other," he wrote.

In the letter Sanders said that the group recently published an article on ThinkProgress that criticized him "for my appearance and for the income I earned from writing a book."

"Then, a day later, you published a video that dishonestly attacked me for hypocrisy in my effort to address income inequality in America," he said.

He added that the group ”unfairly targeted” Warren in 2017 and 2018 as well as Booker earlier this year for teaming with Sanders on a prescription drug bill.

“I will be informing my grassroots supporters of the foregoing concerns that I have about the role CAP is playing. Should your actions evolve in the coming months, I am happy to reconsider what kind of partnership we can have," Sanders wrote.

Sanders's campaign did not immediately respond to a request for comment from The Hill on CAP's response to his letter.