First: CNN has learned that the homeland security secretary waited a full 72 hours to sign off on a request for more first responders to the deadly Texas flooding. 

Plus: A couple of days after President Trump publicly turned on Vladimir Putin, he threatens Brazil with massive tariffs if they don't stop a "witch hunt" targeting the country's former leader. 

And: The authors of a new, revealing look at the presidential race that captivated the world join us to talk about new details, including Donald Trump's belief that in another life, he and Joe Biden may have been golfing buddies. 

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