Scary and threatened with his knife. The flash flood catastrophe in the south. 20 inches of rain leaving townse under forcing children to be rescued from day care. Now millions across the country facing the biggest heat wave of the summer. Roker will have the latest. Lz fighting aheimers disease. New research and what could be a major factor and some simple things you cano to preventt. And 50 years after the apollo 11 launch,hy we are all still moon struck. Announcer this is nbc nightly news with lester holt. And good evening, everyone. We start with breaking news tonight. The house of representatives voted tonight to officially condemn President Trump for his racist tweets. Several republicans joining democrats in ving for the resolution. The vote forced members to take a public position on thees prents demeaning call for a grou of liberal Congress Women toheo back and fix tlaces they came from. All of the women are of color and most born in the u. S. But the vote unlikely to shame mr