part. look, north korea which was testing everything left, right, and center for years and threatening the united states hadn't done so in that two-year period, roughly two-year period, and he's right. they hadn't, and it was a clear willing -- there was clear willingness on the north korean's part to suspend that demonstration and try to see what could happen diplomatically. they'll say all north korea was repeating what they had done before and trying to get out of it. >> this could be a clear escalation over the last two years if there's a long range missile test. ann, thank you for being here. appreciate it. for only the third time in 243 years the president of the united states has been impeached. while you may know the ins and outs this time around of impeachment, it really is a rarely used constitutional power. here's nbc's lester holt. even in the infancy of our