McMaster says 'of course' Trump supports NATO Article 5

U.S. National Security Adviser H.R. McMaster said on Saturday that "of course" President Donald Trump backed NATO's mutual defense doctrine, despite not making an explicit reference to it during a visit to Brussels this week.Speaking at NATO headquarters earlier this week, Trump disappointed allies by not mentioning his support for Article 5, which states that an attack on one member of the alliance is viewed as an attack on all.During his election campaign, Trump appeared to called Article 5 in