"The residents of our states and the American people deserve a thorough investigation that makes clear the extent of Russian meddling, any collusion by Trump campaign officials, and any cover-up," the letter stated. "We urge you to appoint a special counsel immediately."
On Tuesday, Trump fired Comey on the recommendation of Attorney General Jeff Sessions and Deputy Attorney General Rod Rosenstein.
The letter noted that Trump firing Comey during the investigation into alleged interference by Russia in the US election and Tramp campaign collusion with Moscow is a "violation of the public trust."
Rosenstein must consider the damage that attempts by the administration to derail or delegitimize the investigation are doing to the American democratic system, the letter added.
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