Sessions, like other nominees of President-elect Donald Trump, is on course for a committee vote before Trump is inaugurated on January 20.

But three liberal groups -- the National Council of Asian Pacific Americans, People For the American Way and Alliance for Justice -- say his January 10 confirmation hearing should be delayed.

The groups say Sessions failed to provide media interviews, speeches, op-eds and more from his time as US attorney in Alabama, the state's attorney general and from his first term as senator, from 1997 through 2002.

They said Sessions listed just 20 media interviews, 16 speeches outside the Senate, two op-eds, an academic article and a training manual, as well as just 11 clips of interviews with print publications -- including none prior to 2003.

"Sen. Sessions claims that records do not exist for the vast majority of press interviews he has given over the years. However, many are easily located online," the groups said, calling the omission "inexplicable."

Aides helping with Sessions' confirmation did not immediately respond to a request for comment.

But the office of Senate Judiciary Committee Chair Charles Grassley said Trump's choice for the post has been forthcoming with information.

"The notion that Senator Sessions -- somebody who committee members have known and served beside for 20 years -- hasn't made a good faith effort to supply the committee with responsive material is preposterous," said a spokeswoman for Grassley, an Iowa Republican. "It's been clear from the day Senator Sessions' nomination was announced that the left-wing advocacy groups aren't interested in a fair process and just want a fight. We trust the minority committee members will have the courage to give Senator Sessions the fair and respectful process he deserves."

Democrats have hoped to delay the confirmations of Trump nominees they see as most objectionable.

"Despite being voluminous, Sen. Sessions' production appears to have been put together in haste and is, on its face, incomplete," Feinstein said in a mid-December letter to Grassley.

CNN's Laura Jarrett contributed to this report.

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