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very dangerous, and i hope that as the nation watches that we -- to say we should sound the alarm across the nation were entering dangerous territory. >> that was one of two democrats in tennessee that was just expelled after participating in a gun violence protest on the floor of the statehouse. well have much more on this partisan punishment just ahead meanwhile on capitol hill one of donald trumps most vocal allies in congress sends a subpoena to a former prosecutor in the manhattan...

>> announcer: this is "nbc nightly news" with lester holt good evening, and welcome. after a dangerous confrontation in the skies, a warning tonight from russia to the u.s. not to fly aircraft near its airspace throwing the onus on the united states for that midair collision between a russian and american plane over the black sea yesterday. the u.s. making clear its pilotless surveillance plane was flying legally in international airspace when it was knocked from the sky by a russian...

The threshold to avoid a, quote, host of catastrophic changes. they were aiming not to reach that threshold for another 80 years. but we are already seeing those catastrophic changes right here at home. joining me now one of the journalists behind this report washington post" environment and energy reporter chris moony. chris, great to have you with us and thanks for putting all this together. this is a startling report. and i know that your team found that 71 american counties have already hit ...

Obama said the u.s. military mission in libya is, quote, succeeding and has helped avoid a, quote, humanitarian catastrophe. but he also stressed the boundaries of u.s. involvement. >> as i pledged at the outset, the role of american forces has been limited. were not putting any ground forces into libya. our military has provided unique capabilities at the beginning. but this is now a broad international effort. >> the president briefed mostly by phone conference, congressional leaders from both...