(CNN) The House Judiciary Committee chairman said Wednesday that his panel would subpoena special counsel Robert Mueller's final report if William Barr, President Donald Trump's nominee for attorney general, does not release it to the public.

"If necessary, our committee will subpoena the report. If necessary, we'll get Mueller to testify," Rep. Jerry Nadler, a New York Democrat, told CNN's Anderson Cooper on "Anderson Cooper 360." "The American people need the information here."

Mueller is investigating Russian interference in the 2016 campaign and possible collusion between Trump associates and Russians during the 2016 presidential campaign.

Barr was nominated by the President after Trump fired his last attorney general, Jeff Sessions, in November. The President had repeatedly and publicly criticized Sessions after he recused himself from overseeing Mueller's investigation. Matt Whitaker was then appointed the acting attorney general.

Barr appeared before the Senate Judiciary Committee earlier this week for his confirmation hearing and pledged to release "as much as I can" of Mueller's findings to the public and to provide the special counsel with the resources and time to finish the job.

Read More