I realize that this is completely speculative correlation buuuut...
Part of me wonders if Trump was briefed on the Russian law going into effect last month :
Nov 2019 - https://www.bbc.com/news/world-europe-50507849
Russia has passed a law banning the sale of certain devices that are not pre-installed with Russian software.
The law will come into force in July 2020 and cover smartphones, computers and smart televisions.
And is literally just aping Russian policy :
August 2020 - https://www.state.gov/announcing-the-expansion-of-the-clean-...
Clean Store: To remove untrusted applications from U.S. mobile app stores. PRC apps threaten our privacy, proliferate
viruses, and spread propaganda and disinformation. American’s most sensitive personal and business information must be
protected on their mobile phones from exploitation and theft for the CCP’s benefit.