The evidence strongly supports the statement. Multiple sources report that President Trump has issued warnings and threatened tariffs to dissuade BRICS nations from moving away from the U.S. dollar. A statement attributed to him says, 'The idea that the BRICS Countries are trying to move away from the Dollar while we stand by and watch is OVER.' Another source connects his tariff threats to 'anti-American policies.' While the exact word 'attack' is not in the provided excerpts, his rhetoric and policy threats clearly frame the BRICS' de-dollarization efforts as a hostile act against the U.S. dollar.