From China to Europe, Canada to Mexico, world markets are already reeling from Donald Trump's promise to jack up tariffs when he becomes U.S. president in less than two weeks.

U.S. stock futures were stalling 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.