By David Jackson, USA TODAY WASHINGTON — For the second time in two weeks, John McCain is taking his presidential campaign across the border. The presumptive Republican nominee travels to Colombia on Tuesday and Mexico on Wednesday to discuss free trade, the war on drugs, organized crime and national security, McCain foreign policy adviser Randy Scheunemann said. "We have shared interests and shared values with our Latin American partners," he said. While McCain's support of free trade dominated the Arizona senator's June 20 visit to Canada, this trip also is expected to include discussion of a politically sensitive topic: immigration. McCain's support of "comprehensive immigration reform" — tighter border security combined with more temporary foreign workers — has drawn scorn from some GOP conservatives who want illegal immigrants already in the USA to be deported. Rep. Tom Tancredo, R-Colo. said "comprehensive" is "code for amnesty." Last week, McCain and Democrat Barack Obama mixed it up over immigration before a group of high-profile Hispanics, a key voting bloc. Appearing Saturday before the National Association of Latino Elected and Appointed Officials (NALEO), McCain said failed efforts to overhaul immigration laws proved to him that most Americans want the border secured first. He said the U.S. should then develop a "guest-worker" program that is "verifiable and truly temporary." In his remarks, Obama praised McCain's past work on comprehensive immigration legislation. But Obama added that "when he (McCain) was running for his party's nomination, he walked away from that commitment" to placate critics. Democrats have accused McCain of talking tough on border issues to conservatives, while stressing the need for worker programs to Hispanic groups. "Maybe McCain's trip will give him some time to figure out which way he intends to go," said Democratic Party spokesman Damien LaVera. McCain's schedule includes meetings with Colombian President Alvaro Uribe and Mexican President Felipe Caldero´n. On trade, McCain has criticized Obama for suggesting he might want to rework the North American Free Trade Agreement with Mexico and Canada because it has cost U.S. manufacturing jobs. McCain has also hit Obama for opposing a Colombian free-trade deal. Obama said he believes in "fair trade" in which other countries improve their labor standards, a factor he cited in opposing the proposed deal with Colombia. Obama, meanwhile, announced Saturday that he'll go to Britain, France, Germany, Israel and Jordan to meet with allies concerning such issues as terrorism, nuclear proliferation and climate change. The schedule for the July trip has not been announced.