WASHINGTON—The Treasury Department said Tuesday that it is conducting an “operational efficiency assessment” of its payment systems and that the agency hasn’t suspended or rejected any payment instructions,

A Treasury Department official has written a letter to federal lawmakers saying that a tech executive working with Elon Musk’s “Department of Government Efficiency” will have “read-only access” to the

An aide to Elon Musk has administrative privileges in the Treasury Department’s payment system, according to two separate news reports — something the White House has denied. Musk is in charge of the so-called Department of Government Efficiency,