After only a few minutes at the podium, however, the transmission of his speech was interrupted without warning.1 President Maduro had ordered a blanket broadcast across all radio and television stations–what is known in Spanish as a cadena nacional. These presidential broadcasts resemble a US Oval Office address in style, but in Venezuela the law obliges both state‑owned and private media to carry the transmissions, which have lasted as long as eight hours. When Maduro invoked this law to interrupt Torrealba’s speech, Venezuelans had no choice but to listen to Maduro or simply switch off their TVs and radios.

Source: Center for International Media Assistance – 5/15/2017