Victoria Nuland said the United States was taking a "tough look at Bitcoin" following a major ransomware attack and suggested El Salvador take a similar approach.
Salvadoran President Salvador Sanchez Ceren is due to meet with his Chinese counterpart Xi Jinping, just months after the small Central American nation broke its diplomatic ties with Taiwan
China and the U.S. are sparring over El Salvador's decision to drop Taiwan in favour of diplomatic relations with Beijing, with a Chinese spokesperson accusing Washington of trying to deter other nations from making a similar switch.