The inauguration of Venezuelan President Nicolás Maduro has left his opponents grappling with conflicting feelings of hope and disappointment, pondering why the leftist leader could not be stopped despite credible evidence that he had lost the election last year.

President-elect Donald Trump says Venezuela's embattled opposition leader must be protected as President Nicolas Maduro takes the oath of office for a third six-year term.

Maria Corina Machado, a 57-year-old engineer with rock-star appeal, became the fearless figurehead of Venezuela's opposition after being barred from challenging strongman Nicolas Maduro in elections last July.