Former Defense Secretary Robert Gates has judged both Republican and Democratic residential candidates for their ideas on foreign policy, but it s clear that he only believes that there s one nominee that is  beyond repair    Donald Trump.Gates, who has served under George W. Bush as well as Barack Obama, recently published a brutal op-ed in the Wall Street Journal that examines both Trump and Hillary Clinton for their plans on handling America s challenging relations with nations like Russia, China and the Middle East.Although Clinton was nowhere near exempt from criticism, Gates saved his harshest words for her GOP rival. Gates noted that the former Secretary of State has much-discussed credibility issues apart from national security, but these also influence foreign perceptions of reliability and trust.  However, Trump is  in a league of his own  when it comes to credibility.Gates reminded Americans that Trump openly supports and shines praise on leaders like Vladimir Putin and Saddam Hussein, and is all for unethical torture practices and the killing of terrorist s families. Gates also mentioned the fact that Trump likes the idea of Japan and South Korea developing nuclear weapons. Gates said: At least on national security, I believe Mr. Trump is beyond repair. He is stubbornly uninformed about the world and how to lead our country and government, and temperamentally unsuited to lead our men and women in uniform. He is unqualified and unfit to be commander-in-chief. As soon as Gates  op-ed was discovered by Trump, the business mogul predictably went on Twitter to throw one of his infamous man-baby temper tantrums:TwitterTo challenge Trump s tweet, NPR Morning Edition reporter Steve Inskeep invited Trump to an interview about foreign policy on his show, which the Trump campaign had said they d do about 250 days ago.TwitterAs expected, the Trump campaign has now fallen silent on the subject.Featured image via Chip Somodevilla and Spencer Platt / Getty Images