> Yes, and the US government should investigate that

Well, there is also a problem in that the US government agencies tasked with investigating such things are currently very compromised.

Todd Blanche, the Attorney General/head of DOJ, constantly says that his job is to protect the Trump administration. And Trump is linked to this whole story in various ways.

So there will be no fair investigation for the foreseeable future, other than potential congressional oversight hearings next year after the Democrats take control of Congress.