Twenty former U.S. attorneys all appointed by GOP presidents gave 2020 Democratic nominee Joe Biden their strongest endorsement in an open letter slamming President Donald Trump s politicization of the Justice Department.

Trump has clearly conveyed that he expects his Justice Department appointees and prosecutors to serve his personal and political interests in the handling of certain cases such as the investigations into foreign election interference and the prosecution of his political associates and has taken action against those who have stood up for the interests of justice, says the letter signed by ex-prosecutors who served in Republican administrations from Dwight Eisenhower to George W. Bush.

They also warned Trumps leadership is a threat to the rule of law in our country.

Biden, the attorneys wrote, has devoted his career to supporting law enforcement, protecting the independence of the Justice Department, and working to ensure that the federal government exercises its law enforcement powers fairly and impartially and in the interests of all Americans.