President Donald Trump is expected to sign a memorandum Friday that opens the door to levies in response to digital services taxes some countries impose on US tech giants, people familiar with the plans said, the latest step to expand a tariff war aimed at addressing imbalances in global trade.

The memo, which the people familiar discussed on condition of anonymity before it is made public, focuses broadly on digital trade issues. Friday’s action directs the Office of the US Trade Representative to develop remedies for the taxes that foreign governments impose on US tech companies such as Alphabet Inc. and Meta Platforms Inc., the people said.