News that Department of Government Efficiency led by Elon Musk now has access to a government payment system that is responsible for $6 trillion in annual federal payments — including Social Security and Medicare benefits — has prompted criticism from Democratic lawmakers and advocates.

Elon Musk is facing scrutiny over accusations he gained access to sensitive Treasury data, including Social Security and Medicare information.

Sovereign wealth funds are some of the most powerful — and secretive — investors in the world, with more than $13 trillion estimated to be in their accounts. Run by government entities in a wide variety of countries,