The opposition leader has said he wants to rally supporters and continue his push for the ouster of President Nicolás Maduro. His return could spark a showdown with Maduro.
"The struggle in Venezuela is between dictatorship and democracy," U.S. Vice President Pence said in Colombia. He was there to support Juan Guaidó, who has declared himself Venezuela's interim leader.
The meeting is set for Monday in Bogota, Colombia. At least four peoplewere killed in clashes at the border Saturday, as military forces blocked humanitarian aid from entering the country.
History suggests that if the U.S. takes too large a role in the South American country's crisis, it could spark a worse backlash than the original issue, experts and former diplomats warn.
President Nicolás Maduro issued the order in an apparent effort to make it harder for international aid to enter the country and buoy his political opponent, Juan Guaidó.
The U.S. president urged military leaders to stop blocking food aid from entering the country, and said those who refuse to accept the opposition leader "will find no safe harbor ... no way out."
Some aid workers are being denounced as opposition activists and there are fears that all aid could be blocked. The situation could soon resemble a "medieval siege," warns an analyst in Caracas.
The military, which backs President Nicolás Maduro, has barricaded a bridge from Colombia. Opposition leader Juan Guaidó, along with the U.S., is demanding that the aid convoy be allowed to pass.
The once impressive medical system has crumbled dramatically in Venezuela's ongoing crisis. Measles is resurgent; HIV patients aren't getting drugs. Even catheters are in short supply.