BOSTON (AP) — A group of 20 attorneys general, all Democrats, is calling for the appointment of an independent special counsel to continue the investigation into Russian interference in last year’s presidential election.

The group led by Massachusetts Attorney General Maura Healey called Republican President Donald Trump’s firing of FBI Director James Comey during the ongoing investigation a “violation of public trust.”

The group said in a Thursday letter to Deputy Attorney General Rod Rosenstein that only the appointment of an independent special counsel “with full powers and resources” can begin to restore public confidence.

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Those signing the letter include the attorneys general of California, Connecticut, Delaware, the District of Columbia, Hawaii, Iowa, Illinois, Maine, Maryland, Minnesota, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Rhode Island, Virginia, Vermont and Washington.