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Charles Krauthammer said that Sen. Ted Cruz (R-TX) "blew it" at the Republican National Convention with his address in which he did not endorse Donald Trump.

"What Cruz delivered was the longest suicide note in American political history and this morning he added an addendum," said Krauthammer. 

Krauthammer weighed in on America's Newsroom this morning after Cruz spoke to Texas delegates (some of them angry), doubling down on his message from last night and going even further.

Cruz explained that he is "not in the habit of supporting people who attack my wife and attack my father."

Krauthammer said Cruz "undid the great political, philosophical reasons he offered last night" for not endorsing Trump by making it personal. 

"As of this morning, I think he's destroyed his political career right there," said Krauthammer.

A.B. Stoddard said Trump needs to make a forward-looking, optimistic speech tonight and should "really" not talk about Cruz in his big address. 

Steve Hayes disagreed with Krauthammer, saying this is a political "gamble" for Cruz in the short-term but he could benefit in the long-term. 

Hayes said Cruz is trying to emphasize that not all Republicans are with Trump, bringing up the nominee's past attacks on John McCain's military record, Carly Fiorina's appearance and Trump's mockery of a disabled reporter.

"They're embracing him after that and I think it's important to say, 'not everyone's along for the ride,'" said Hayes.

Watch the discussion above.

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