When President Trump announced a ban on travel for citizens from several predominantly Muslim countries in January, a coalition of officials from various blue states quickly rallied to fight it.
"We just started talking to each other Friday afternoon," recalls New York Attorney General Eric Schneiderman. "By Sunday morning, we had 17 states signed on to say, 'This is unconstitutional. We're going into court to stop it.' And we went into courts all over the country and eventually got it struck down."