Sen. Mike Lee: Stepping Down is Trump's Only Honorable Path
01:34Utah Senator Mike Lee tells Chuck Todd that he believes Donald Trump can still salvage his legacy, but only by stepping down.
Bloomberg on climate change: 'This world is in trouble'
21:04Bloomberg on 2020: Any candidate ‘better darn well have a plan’ on climate change
01:15Politics and climate change: How to break the paralysis
07:43How do we explain the urgency of climate change?
10:31Most Americans agree on climate change, but there’s still a serious political divide
02:02Full Jerry Brown: Climate change is about inventing, 'not just adapting'
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