Fifty national security advisers and experts who served in Republican administrations from Richard Nixon to George W. Bush have come out with a new letter expressing dismay, concern and outright fear about Donald Trump's ability to lead the nation and keep the country safe.

"None of us will vote for Donald Trump," it said although it says later that not voting for Trump did not necessarily mean everyone would be supporting Clinton.

The letter goes on to say that Trump "lacks the character, values and experience to be president," that he "weakens U.S. moral authority," "appears to lack the 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."

Trump, the letter accuses has "alarmed" American allies with his "erratic behavior."

http://talkingpointsmemo.com/livewire/50-national-security-advisers-say-trump-cannot-be-president