A top Democrat has demanded to know why the Trump administration “inexplicably killed” a criminal investigation into the late convicted sex offender Jeffrey Epstein’s alleged co-conspirators as he accused the justice department of a “shameful and gigantic cover-up”.

Jamie Raskin, a House judiciary committee member and congressman from Maryland, claimed the decision to end the investigation in July had shielded an alleged network of “powerful individuals accused of enabling and engaging in the massive billion-dollar sex trafficking operation” while ignoring the accounts of women exploited by Epstein.

In a letter to the US attorney general, Pam Bondi, on Monday, Raskin asked: “Why would the Trump Administration, the Department of Justice (DOJ), and the Federal Bureau of Investigation (FBI) kill an ongoing criminal investigation into a massive and decades-long criminal sex trafficking ring that preyed on girls and young women? Who exactly are you intending to protect by this action?”