India, Jan. 15 -- A president who cannot tweet is instead spending his time banning Chinese tech companies.

Donald Trump, who leaves office on January 18, has blacklisted Beijing-based smartphone maker Xiaomi and ten other Chinese technology companies.

Unless reversed by the incoming Biden administration, the move will halt US investors from buying shares in 60 days, forcing Americans to divest their holdings by the year's end.

It has been a confused process, with companies frequently added to the Pentagon's list, and amendments to the original presidential order itself.

The New York Stock Exchange itself has been unsure how to apply the executive orders, reversing itself twice in a week earlier this month over whether to delist China...