Nicolas Maduro

President Nicolás Maduro, through allies, is ratcheting up legal and political pressure on the opposition leader by removing his parliamentary immunity.

The U.S. has hit Venezuela's oil sector and government associates with sanctions and has rallied behind opposition leader Juan Guaidó, yet President Nicolás Maduro persists.

The country has been hobbled by a blackout since Thursday. People wait in long lines for gas and water, and increasingly are having difficulty communicating by phone or Internet.

With some parts of Venezuela still experiencing power outages, opposition leader Juan Guaidó and President Nicolás Maduro held rival rallies in Caracas.

President Nicolás Maduro blamed the "electricity war" on the United States, while opposition leader Juan Guaidó said the onus was on Venezuela's ruling party, "the usurpers."

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 people were killed in clashes at the border Saturday, as military forces blocked humanitarian aid from entering the country.

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 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.