The buck's latest surge comes as rising Treasury yields attract funds, and so-called 'U.S. exceptionalism' - a strong economy containing many of the world's biggest and most successful companies - encourages global investors to buy American assets.

U.S. stock futures were rising early Tuesday as the market grapples with possible repercussions from any tariffs imposed by President-elect Donald Trump. Trump quashed speculation that he would pare back plans to introduce across-the-board tariffs on imports when he takes office later this month.

The S&P 500 Index ($SPX) (SPY) today is down -0.24%, the Dow Jones Industrials Index ($DOWI) (DIA) is down -0.34%, and the Nasdaq 100 Index ($IUXX) (QQQ) is down -0.18%. March E-mini S&P futures (ESH25) are down -0.