Wednesday on the NewsHour, a shooting at a Florida high school results in numerous fatalities. Also: Trump administration officials use taxpayer money for lavish travel, the science of counting North Korea's nuclear weapons, Sen. David Perdue on the immigration debate…

Tuesday on the NewsHour, top intelligence officials say the White House clearance system is broken, as questions swirl around disgraced aide Rob Porter. Also: The Senate kicks off immigration debate, Baltimore’s deteriorating school buildings, police officers convicted in a corruption…

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