Investing.com-- The Chinese yuan hit a four-month low against a rallying dollar on Monday as Asian currencies fell sharply on U.S. President-elect Donald Trump's latest threat to impose hefty tariffs on BRICS nations.Trump threatened to impose 100% tariffs on BRICS countries - including Brazil, Russia, India, China, and South Africa - in a social media post on Sunday. He vowed of severe economic consequences for any nation attempting to undermine the U.S. dollar’s dominance by backing alternative currencies. His warning, aimed at countries seeking to reduce their reliance on the dollar in global trade, sent ripples through Asian markets, with concerns mounting over potential disruptions in trade relations.The threat follows Trump’s earlier vow to impose higher tariffs on goods from China, Mexico, and Canada, sparking fears of a renewed trade war between the world’s largest economies. Heightened tensions weighed heavily on sentiment towards risk-driven markets in Asia, denting regional currencies.The US Dollar Index surged 0.5%, while the US Dollar Index Futures jumped 0.4%, benefiting from the greenback's status as a global safe-haven asset.The South Korean won, and the Japanese yen led losses among Asian currencies, with the USD/JPY pair rising 0.6% and South Korea's USD/KRW climbing 0.7%.The Singapore dollar’s USD/SGD pair, and the Thai baht’s USD/THB pair fell 0.5% each.The Indian rupee's USD/INR pair rose 0.2% to a record high of 84.708 rupees.The rupee was also pressured by data on Friday that showed that India's gross domestic product growth slowed in the July-September period compared to the previous quarter.  Still, India maintained its status as the world’s fastest-growing major economy, outpacing China’s 4.6% growth during the same period.