John Heilemann: Pressure is building on Republicans, and soon they'll need Trump to intervene

Let's now bring in MSNBC National Affairs Island analyst and a partner and chief political columnist at Puck, John Hileman, as well as MSNBC senior national security reporter, David RH. And David, let's let's start right there uh with this sort of seemingly almost out of nowhere announcement from President Trump about uh the nuclear testing that he's ordered up. You know, seems as if in response to what Vladimir Putin had said earlier in the day.But the United States, as we've been noting, has not done this ...