U.S. Rep. Seth Moulton (D-Salem) is backing state Auditor Diana DiZoglio’s effort to audit the Massachusetts Legislature, saying Beacon Hill is ignoring the will of the people.

Moulton voiced his support for DiZoglio's efforts on X last week. The post came after DiZoglio filed a lawsuit in the Supreme Judicial Court seeking to enforce a 2024 ballot law that gives her the power to audit the Massachusetts House and Senate.

“In a democracy, the people have the power,” Moulton wrote. “In Massachusetts, 72% of voters demanded transparency by voting to audit the Legislature. That was well over a year ago. Voters did their job. Beacon Hill needs to do theirs. Stop standing in the way of democracy and let @DianaDiZoglio conduct the audit the voters asked for.”

DiZoglio’s lawsuit names House Speaker Ron Mariano (D-Quincy), Senate President Karen Spilka (D-Ashland), and the clerks of both chambers as defendants. The auditor is asking the court to allow her to hire outside counsel – backed by Republican gubernatorial candidate Mike Minogue – and to order lawmakers to turn over documents she has requested.

Fifteen months after voters approved the audit measure, DiZoglio says legislative leaders are still refusing to comply.

“This is not just about an audit anymore,” DiZoglio told reporters last week. “This behavior is permeating state government, and it is causing people to lose trust and faith in their state government, in their leaders, in their courts, in their lawmakers, across the board.”

Legislative leaders have argued that allowing the auditor to examine internal legislative operations would violate the separation of powers outlined in the state constitution.

Attorney General Andrea Joy Campbell declined to represent DiZoglio in court – and questioned her authority to move forward independently.

“This is another ploy to sidestep the required approval of my office and will bring her no closer to auditing the Legislature,” Campbell said in a statement last week. “This filing is not about enforcing the law. In order to enforce the law, she would answer my office’s straightforward questions, including how privileges given to the Legislature in our state constitution nearly 250 years ago impact her authority to audit the Legislature.”

State Sen. Cindy Friedman (D-Arlington), who leads a Senate subcommittee reviewing the ballot law, suggested the auditor’s effort is politically motivated.

“To date, the information the Auditor has provided the Senate regarding what she is seeking has been vague at best,” Friedman said in a statement last week. “Given that, and that an independent, professional audit is done annually, we must assume that the Auditor’s intentions are purely political.”

DiZoglio has said she is seeking financial documents that would be public information for other government entities.

“It is unacceptable that any one of our lawmakers would defend withholding taxpayer-funded financial receipts or state contracts,” she said.

The Supreme Judicial Court will now decide whether the Legislature must comply with the voter-approved law and whether DiZoglio can pursue the audit without the attorney general’s approval.