The US Senate banking committee wrote a letter to facebook questioning about the nature and legality of it's cryptocurrency project code named Libra.
https://www.banking.senate.gov/imo/media/doc/5.9.19%20Facebook%20Letter.pdfThey essentially asked whether it would enable users to have privacy and would make it harder for the government to monitor every personal and financial moves of people in the US and around the world.
These are good questions coming from the US government, they know that Facebook coin will have a huge impact on society, this is not just another project with a coin, this will create a massive promotion on cryptocurrency, and the government knows that cryptocurrency is decentralized, we'll see what's going to happen.