US vows to pressure Venezuela's 'illegitimate' Maduro

Update: Venezuela's President Nicolas Maduro was sworn in Thursday for a controversial second term, posing a challenge to the United States and much of the international community that have branded his mandate illegitimate.

Maduro, 56, was sworn in by Supreme Court president Maikel Moreno, amid cheers and applause by a crowd of hundreds attending the inauguration in Caracas.

The ceremony was boycotted by the European Union, United States and Venezuela's South American neighbors.

"The US will not recognize the Maduro dictatorship's illegitimate inauguration," national security advisor John Bolton tweeted.