The Federal Emergency Management Agency on Tuesday suspended more than 20 employees who signed an open letter arguing the Trump administration had undone years of post-Hurricane Katrina progress at the disaster relief agency, multiple sources told CBS News.

Monday's open letter to Congress — known as the "Katrina Declaration" — said it was signed by 191 current and former FEMA employees. Some 35 attached their names, while the rest said they withheld them over fear of retaliation.

Some of the current FEMA employees who used their names received emails on Tuesday night saying they had been placed on paid administrative leave "effective immediately, and continuing until further notice," according to copies of the emails reviewed by CBS News.

"While on administrative leave, you will

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