Donald Trump says Venezuela's embattled opposition leader must be protected, as President Nicolas Maduro prepares to take the oath again after allegedly stealing an election.

President Nicolás Maduro will extend his increasingly repressive rule over Venezuela until 2031 when he is sworn in on Friday, despite credible evidence that his opponent won the latest election and following protests against his plan to serve a third six-year term.

Venezuelan President Nicolás Maduro was sworn in for a third six-year term Friday despite international condemnation of his recent reelection as illegitimate, as his administration grows increasingly brazen in cracking down on opponents.