Venezuelans hold rival marches for and against government

A woman holds a sign with a message that reads in Spanish; "#Maduro resign now," during an opposition protest in Caracas, Venezuela, Saturday, March 12, 2016. Opponents of Venezuelan President Nicolas Maduro marched Saturday demanding his resignation after the opposition coalition announced a new campaign of protests, and proposals for legislative reform to reduce his presidential term. (AP Photo/Ariana Cubillos)

A man holds his fist next to a poster depicting President Barack Obama, during an anti-U.S. rally, in Caracas, Venezuela, Saturday, March 12, 2016. President Nicolas Maduro called back Venezuela's top diplomat in Washington, protesting the renewal of sanctions by Obama on several of Venezuela's top officials over human rights violations. The two nations haven't exchanged ambassadors since 2010. (AP Photo/Fernando Llano)

People take part in an opposition protest calling for the resignation of Venezuelan President Nicolas Maduro in Caracas, Venezuela, Saturday, March 12, 2016. Opponents marched Saturday announcing a new campaign of protests, and proposals for legislative reform to reduce Maduro's presidential term. (AP Photo/Ariana Cubillos)

A man holds a sign with a message that reads in Spanish; "Venezuela demands a resignation," during an opposition protest in Caracas, Venezuela, Saturday, March 12, 2016. Opponents of Venezuelan President Nicolas Maduro marched Saturday demanding his resignation after the opposition coalition announced a new campaign of protests, and proposals for legislative reform to reduce his presidential term. (AP Photo/Ariana Cubillos)

A man holds up posters, one showing an image of President Barack Obama with a message that reads in Spanish; "Assassin, fascist, imperialist", during an anti-U.S. rally, in Caracas, Venezuela, Saturday, March 12, 2016. President Nicolas Maduro called back Venezuela's top diplomat in Washington, protesting the renewal of sanctions by Obama on several of Venezuela's top officials over human rights violations. The two nations haven't exchanged ambassadors since 2010. (AP Photo/Fernando Llano)

Venezuela's President Nicolas Maduro, left, and his wife Cilia Flores, greet supporters as they arrive to take part in an anti-U.S. rally, in Caracas, Venezuela, Saturday, March 12, 2016. Maduro called back Venezuela's top diplomat in Washington, protesting the renewal of sanctions by President Barack Obama on several of Venezuela's top officials over human rights violations. The two nations haven't exchanged ambassadors since 2010. (AP Photo/Fernando Llano)