It is not viable for Venezuelan opposition leader Edmundo Gonzalez to enter the country, his ally Maria Corina Machado said on Friday, shortly after President Nicolas Maduro was sworn in for a third term despite months of controversy over the country's contested July election.

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.

Machado, a former lawmaker who has spearheaded the opposition to President Nicolas Maduro in recent years, was detained by security agents who shot at motorcycles she was using to leave a protest in Caracas, the capital, according to posts on social media from her party. She was freed about an hour later, according to the party.