By JENNIFER LOVEN, Associated Press Writer 2 hours, 20 minutes ago CANCUN, Mexico - The leaders of the United States, Mexico and Canada are converging in this bikini-and-beer mecca for a second annual show of North American unity. Despite the emphasis on cross-border comity and cooperation, however, the neighbors come together with no resolution of nagging issues that for years have strained U.S. relations with its two largest trading partners. President Bush arrived in Cancun on Wednesday evening to an understated welcome from just a few local officials gathered at the bottom of Air Force One's stairs for the two-day summit with Mexican President Vicente Fox and Canadian Prime Minister Stephen Harper. With separate bilateral meetings set for Thursday, followed by joint sessions with all three leaders on Friday, Bush promptly turned in for the night in his luxury hotel along the Caribbean resort's sugar-white beach while thousands of winter-weary college students prowled Cancun's bars nearby. <snip> The official focus of the trilateral summit is a three-way pact designed to make borders more secure without hampering business and traffic. Signed a year ago near Bush's Texas ranch by Bush, Fox and Harper's predecessor, Paul Martin, the Security and Prosperity Partnership aims to better protect North America from outside attack and ensure its global competitiveness with China and other trade powerhouses. But Fox and Harper come to Cancun with much more on their minds. Both have powerful constituencies at home pressing for progress on problems related to the enormous flow of goods and people between their countries and the United States. Mexico's top priority with its northern neighbor is a migration accord that would address the status of the estimated 6 million illegal immigrants from Mexico now living in the United States. For Canada, issue No. 1 as it looks south is a messy trade dispute over softwood lumber. Bush extended an olive branch in both directions before the trip. He told foreign reporters "don't underestimate" his ability to wring from Congress a guest-worker program that would address some of Mexico's concerns , and said he would "like to get the issue solved" on Canadian lumber tariffs. SOURCE Are these meetings open to the public or do they take place behind closed doors?