The [APEC] summit in ... Chile, was the site of a ... kerfuffle... over the weekend, as the Chileans picked fights with the U.S. Secret Service and lost. The first ... involved Nick Trotta ... in President Bush's security detail. As the president ... entered ..., "Chilean officers, who appeared to be waiting for the moment, stepped in front of Trotta, blocking him from entering," ... U.S. officials said Chilean police had been chafing for a week about a demand by Secret Service agents that they control the president's space... ... amid a flurry of half nelsons, one Secret Service...