Trump artist council members send secret message in resignation letter
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Actor Kal Penn acknowledged Friday that a letter to President TrumpDonald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE announcing his and other's resignations from the president's arts council was intended to spell out "resist."

In the letter, the first letters of each paragraph add up to spell the word, which has become a popular motto for Trump's opponents. 

Responding to a tweet by Hearst Television's Soledad O'Brien pointing out the letters spelled "resist," Penn wrote that he "was wondering who was gonna catch that."

The group resigned from the President's Committee on the Arts and Humanities (PCAH) on Friday, citing the president's recent comments on fatal violence in Charlottesville, Va., in which he appeared to defend white nationalist groups.

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The letter also calls on Trump himself to resign if he does not clearly denounce hate groups. 

The White House responded to the letter, saying that Trump had decided earlier this month not to continue his work with the arts council, because "it is not a responsible way to spend American tax dollars," according to The New York Times' Sopan Debb. 

Penn shot back at Trump after the White House issued its statement. 

The PCAH is the latest presidential council to disband amid growing furor over Trump's statements on Charlottesville. 

On Wednesday, two economic councils disbanded after several prominent business leaders resigned from the panels. A day later, the White House dropped plans to create a council of outside advisers on infrastructure.