There is no one in politics better at playing a bad hand than Ted Cruz. Even before we learned that Donald Trump had given a deeply disturbing interview to the New York Times in which he walked away from our NATO commitments, I thought getting booed off the stage was likely to prove a good career move for Cruz. Now he looks like a genius.

We've all said this a million times over the past year, but Trump's remarks about NATO struck me as disqualifying in a way that his previous ill-considered outbursts were not. Republicans may have cringed at his racist, violence-loving rhetoric, but ultimately they don't care if he's disparaging Latinos, Muslims, or women. But to undermine NATO—why, that's the sort of thing they would falsely accuse President Obama of, or Hillary Clinton.

If these people had any principles, Paul Ryan today would endorse Clinton. Mike Pence would quit the ticket. Of course that won't happen. But conservatives who are not institutionally tied to the Republican Party are going to rage about this for the rest of the campaign. Even before the NATO outburst, for instance, the Washington Post's Jennifer Rubin, a hardline conservative, offered some advice to Clinton on how she could win over Republicans. And here is a leader of the anti-Trump conservative movement, former George W. Bush speechwriter David Frum:

Ten years from now, every delegate in tonight's hall who is still alive will claim to have cheered Ted Cruz— David Frum (@davidfrum) July 21, 2016

There are many lowlights to ponder in the Trump interview, but here's one that really stuck out:

When the world sees how bad the United States is and we start talking about civil liberties, I don’t think we are a very good messenger.

My God. This is exactly the sort of rhetoric that Republicans have been falsely accusing Democrats of using for years. Obama apologized! And, needless to say, Trump is just plain wrong. We have many faults, because we're a country and because we're human. But very few nations are as free as the United States. Trump wouldn't need to build a wall if so many people weren't trying to come here.

If you haven't already, please have a look at Franklin Foer's recent piece in Slate on the ties between Trump and Russian President Vladimir Putin. Finally, I will close by reprising anti-Trump conservative Tom Nichols's tweetstorm from two months ago.

Dan Kennedy is an associate professor of journalism at Northeastern University and a panelist on WGBH 2's Beat the Press.