President Donald Trump closed out his NATO trip in a combative mood, fighting with reporters, issuing a bleak warning for Iran and indicating that United States now needs a 'secretary of war.'

NATO leaders gather Tuesday in The Hague for what could be a historic summit, or one marred by divisions.

As the conflict in the Middle East continued to simmer, U.S. President Donald Trump headed to the Netherlands for his first summit-level meeting with NATO allies since returning…