Manila's relations with Washington appeared to be in critical condition late Thursday after Philippine President Rodrigo Duterte told U.S. President Barack Obama to "go to hell." It was Duterte's strongest outburst yet over criticism of his deadly war on drugs.

Duterte said he may "break up" with the U.S., raising the specter of Washington losing the Southeast Asian ally to China.

White House spokesman Josh Earnest said the comments were "at odds" with the good state of ties between the U.S. and Philippine people.