Colombian President Alvaro Uribe has agreed to host the Pentagon's narcotics-interdiction flight operations, which were recently kicked out of Ecuador.
Manuel Zelaya's visit with President Calderón could mark a new strategy to distance himself from his leftist ally, Hugo Chávez.
Pro-Chavez activists threw tear gas at the headquarters of regime critic Globovision. Human Rights Watch alleges growing restrictions on free expression.
Venezuela and Ecuador have strongly condemned the pending agreement, which would allow the US to use three bases for counternarcotics and counterinsurgency surveillance.
Deposed President Zelaya now says he will return Friday. Honduras's interim leader has refused to allow Zelaya back.
Chief mediator Oscar Arias asked for a 72-hour extension and warned of civil war after talks broke down Sunday.
Nicaragua's leftist leader Daniel Ortega says constitutional limits on presidential terms stand in the way of 'direct democracy.'
Ousted President Manuel Zelaya and the country's interim leaders resume talks in Costa Rica today amid Zelaya's fresh vows to return with or without a deal.
Manuel Zelaya's rhetoric may make this weekend's talks more difficult and could spark violence in the tense and divided country, analysts say.
Costa Rican President Oscar Arias says he is 'determined to have a resolution,' but that it may take some time.