Deputy Attorney General Rod Rosenstein asked federal prosecutors across the country to assist in reviewing documents of Judge Brett Kavanaugh, President Trump’s nominee for Supreme Court, a process that could delay his Senate confirmation, according to a report on Wednesday.

Rosenstein sent an email this week to the nation’s 93 US attorneys requesting each one to provide up to three prosecutors “who can make this important project a priority for the next several weeks,” the New York Times reported.

​The subject line of Rosenstein’s email read, “Personal Message to U.S. Attorneys from the Deputy AG.”

Trump announced his selection of Kavanaugh in a prime-time television event on Monday night to replace retiring Justice Anthony Kennedy.

Kavanaugh, ​who worked in the George W. Bush White House and with Ken Starr’s investigation into former President Clinton and on federal courts, is believed to have generated millions of pages of records.

Senate Democratic Leader Chuck Schumer in a floor speech on Tuesday said the Senate should be able to review all of Kavanaugh’s paperwork before the confirmation process continues “and if that makes us take a little more time, so be it.”

​Sen. Mitch McConnell, the majority leader, said he was pushing to get a confirmation vote on Kavanaugh before November’s midterm elections but worried privately that the volume of documents could be used to delay the proceeding, the Times reported.

​The request was highly unusual because while the Justice Department helps examine Supreme Court nominations, the work is using done by department lawyers, not prosecutors, the newspaper said.

Some described it as a troubling precedent.

“It’s flat-out wrong to have career federal prosecutors engaged in a political process like the vetting of a Supreme Court nominee,” Christopher Hunter, a former FBI agent and federal prosecutor who is running for Congress​, told the Times​. “It takes them away from the mission they’re supposed to be fulfilling, which is effective criminal justice enforcement.”

Justice Department spokeswoman Sarah Isgur Flores acknowledged prosecutors haven’t been brought in to work on recent nominations, but “the scope of the production of executive branch documents we’ve been asked for is many, many times as large​.​”