U.S. Secretary of State Rex Tillerson said diplomatic efforts to rein in Pyongyang¡¯s nuclear weapons program ¡°will continue until the first bomb drops,¡± as the U.S. and South Korean navies kicked off a massive, five-day joint military exercise Monday in the waters surrounding North Korea.

The statement by America¡¯s top diplomat came despite a series of recent tweets by President Donald Trump that seemed to rule out diplomacy, including one that said Tillerson was ¡°wasting his time trying to negotiate with Little Rocket Man,¡± a mocking reference to North Korean leader Kim Jong Un.

Speaking Sunday on CNN¡¯s ¡°State of the Union,¡± Tillerson was asked if Trump¡¯s tweets had undermined any diplomatic push for solving the North crisis.