[...] even as he returned to friendly political turf in Pennsylvania, Trump seems caught between his role as an outsider candidate and that of a now-elected negotiator. With that backdrop he signed an executive order directing the Commerce Department and the U.S. trade representative to conduct a study of U.S. trade agreements. Trump's rally Saturday night in Harrisburg offered a familiar recapitulation of what he and aides have argued for days are administration successes, including the successful confirmation of Neil Gorsuch to the Supreme Court, his Cabinet choices and the approval of construction of the Keystone XL pipeline. [...] North Korea's missile launch Saturday signaled its continued defiance against the U.S., China and other nations, on which Trump tweeted: Bad!