Besides this investigation of DOGE, through the Permanent Subcommittee on Investigations (PSI) US Senator Richard Blumenthal (D-CT) can hold hearings and investigate Ghislaine Maxwell and Jeffrey Epstein. As a minority member though, Senator Blumenthal can only invite witnesses to testify without subpoena power, such as the AUSA and FBI agents who investigated Ghislaine Maxwell (see names in first link).

The Permanent Subcommittee on Investigations is the Committee's chief investigative subcommittee and has the responsibility of studying and investigating the efficiency and economy of operations relating to all branches of the government. The Subcommittee is also tasked with studying and investigating the compliance or noncompliance with rules, regulations and laws, investigating all aspects of crime and lawlessness within the US which have an impact upon or affect the national health, welfare and safety, including syndicated crime, investment fraud schemes, commodity and security fraud, computer fraud, and the use of offshore banking and corporate facilities to carry out criminal objectives.

Links: