50 of America’s most senior Republican national security officials, including several former Republican secretaries of state, have signed an open letter opposing Republican presidential nominee Donald Trump, saying he would be a ‘dangerous’ president.

Those who signed worked for former presidents Richard Nixon, Ronald Reagan, George HW Bush and George W Bush and say they are convinced that Trump would be “the most reckless president in American history”.

The letter is similar to one issued by some of the same Republican former officials and foreign policy experts in March.

Here’s an excerpt: “Mr. Trump lacks the character, values, and experience to be president. He weakens U.S. moral authority as the leader of the free world. He appears to lack basic knowledge about and belief in the U.S. Constitution, U.S. laws and U.S. institutions, including religious tolerance, freedom of the press, and an independent judiciary.”

The letter released on Monday does contain some new names, however, including former UN ambassador John Negroponte, former CIA director Michael Hayden and former secretary of homeland security Tom Ridge.

None of the living former Republican secretaries of state signed the letter, although Condoleezza Rice’s ex-chief of staff, Brian Gunderson, is among the signatories.

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