BRIDGEWATER, N.J. – As the nation reeled from two mass shootings in less than a day, President Donald Trump spent the first hours after the tragedies out of sight at his New Jersey golf course, sending out tweets of support awkwardly mixed in with those promoting a celebrity fight and attacking his political foes. Trump was to travel back to Washington later Sunday and aides said he would likely address reporters, but the nation did not glimpse the president in the immediate aftermath of a shooting in El Paso, Texas, that killed at least 20 people and, hours later, one in Dayton, Ohio, that claimed at least nine lives.