President Donald Trump signed a memorandum Friday to formally consider using tariffs to counter the digital services taxes some countries impose on US tech giants, a step that could expand a global battle aimed at addressing imbalances in trade. The memo called for the Office of the US Trade Representative to propose retaliatory measures, including tariffs, on countries that impose digital taxes on US tech companies such as Alphabet Inc. and Meta Platforms Inc. The White House is seeking to dissuade foreign governments from collecting tax revenue from US tech companies that operate abroad, according to a fact sheet about the action seen by Bloomberg.