Minority Leader Chuck Schumer introduced a resolution that, if passed, would direct the Senate to file or join lawsuits aimed at forcing the Justice Department to comply with the Epstein Files Transparency Act, the law enacted last month that required disclosure of records by last Friday.
"Instead of transparency, the Trump administration released a tiny fraction of the files and blacked out massive portions of what little they provided," Schumer said in a statement.
"This is a blatant cover-up."
In lieu of Republican support, Schumer's resolution is largely symbolic.
The Senate is off until January 5, more than two weeks after the deadline. Even then, it'll likely face an uphill battle for passage. But it allows Democrats to continue a pressure campaign for disclosure that Republicans had hoped to put behind them.
The Justice Department said it plans to release records on a rolling basis by the end of the year.
It blamed the delay on the time-consuming process of obscuring victims' names and other identifying information. So far, the department hasn't given any notice when new records arrive.
That approach angered some accusers and members of Congress who fought to pass the transparency act. Records that were released, including photographs, interview transcripts, call logs, court records and other documents, were either already public or heavily blacked out, and many lacked necessary context.
There were few revelations in the tens of thousands of pages of records that have been released so far. Some of the most eagerly awaited records, such as FBI victim interviews and internal memos shedding light on charging decisions, weren't there.
Nor were there any mentions of some powerful figures who've been in Epstein's orbit, like Britain's former Prince Andrew.
Deputy Attorney General Todd Blanche on Sunday defended the Justice Department's decision to release just a fraction of the files by the deadline as necessary to protect survivors of sexual abuse by the disgraced financier.
Blanche pledged that the Trump administration would meet its obligation required by law. But he stressed that the department was obligated to act with caution as it goes about making public thousands of documents that can include sensitive information. And he said legal precedent had long established that obligations to protect the privacy of victims permit authorities to go beyond deadlines to ensure they are protected.
Blanche, the Justice Department's second-in-command, also defended its decision to remove several files related to the case from its public webpage, including a photograph showing Trump, less than a day after they were posted.
The missing files, which were available on Friday but no longer accessible by Saturday, included images of paintings depicting nude women, and one showed a series of photographs along a credenza and in drawers. In that image, inside a drawer among other photos, was a photograph of Trump alongside Epstein, Melania Trump and Epstein's longtime associate, Ghislaine Maxwell.