This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Tuesday. As someone with protein coffee in their fridge, I can't say I'm surprised that "functional beverages" are taking off. Stock futures are positive this morning. The market is coming off a winning day. Here are five key things investors need to know to start the trading day: The Supreme Court had a busy morning yesterday. The nation's highest court ruled on President Donald Trump's

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