Elon Musk’s team at the Department of Government Efficiency is going to work with US aviation authorities to “rethink” the nation’s airspace, Transportation Secretary Sean Duffy said.

The confirmation of a Musk associate's access to the system codes came in a letter from a Treasury official to Democratic Senator Ron Wyden that said the review was being undertaken to "maximize payment integrity for agencies and the public".

The U.S. Treasury Department has given staff from billionaire Elon Musk's so-called Department of Government Efficiency "read only" access to its payment systems, a department official said in a letter sent to Congress.

The US Treasury has brought in at least two people connected to the so-called Department of Government Efficiency, according to people familiar with the matter: Tom Krause, the chief executive of Cloud Software Group Inc.