CAIRO — U.S. Secretary of State Mike Pompeo brought the Trump administration’s anti-Iran message to Gulf Arab states on Friday, arriving in Bahrain to continue a nine-nation tour of the Middle East aimed at reassuring America’s partners that withdrawing troops from Syria does not mean Washington is abandoning the region. Pompeo was traveling to Bahrain and the United Arab Emirates where he will call for increasing pressure on Iran and push for unity among Gulf neighbors still embroiled in a festering dispute with Qatar.