Venezuela and Ecuador have strongly condemned the pending agreement, which would allow the US to use three bases for counternarcotics and counterinsurgency surveillance.
The leftist militants have launched 'plan rebirth' following a year of withering setbacks.
Lawmakers passed a measure late Tuesday calling for a referendum on whether to allow the popular President Álvaro Uribe to run for a third term. Critics say that would be bad for democracy.
Uribe's sixth attempt may succeed. Congress is now debating a constitutional amendment that would prohibit personal use and possession of small amounts of 'recreational' drugs.
In war-torn Colombia, new villages mark a rare win for both natives and the environment.
The embattled guerrillas are attacking urban areas that they had been pushed out of by a sustained military campaign under President Uribe.
Hebert Veloza Garcia's extradition will stymie efforts to find justice for his victims, say Colombian human rights groups.
Officials visiting this week press for continued funding of an antidrug strategy and passage of a free-trade agreement.
The release of four hostages Sunday marks an attempt by FARC to regain public credibility after a devastating year, say analysts.