The chairman of the House Judiciary Committee is threatening to subpoena Attorney General William Barr if he does not show up for a scheduled hearing later this week.
Rep. Jerry Nadler, D-N.Y., told CNN he will work within his powers as committee chairman to compel Barr to attend.
"The witness is not going to tell the committee how to conduct its hearing. Period," Nadler said.
He added if Barr skips the hearing, "then we will have to subpoena him, and we'll have to use whatever means we can to enforce the subpoena."
Barr is sparring with the Democrat-led committee over the format of the planned questioning during the hearing.
The Department of Justice does not want committee counsels from both parties to question Barr after the hearing. It also disagrees with Democrats' plans to go into a closed session if members of the panel would like to discuss classified portions of the Mueller report.
House Speaker Nancy Pelosi says Attorney General William Barr will be "obstructing Congress" if he chooses not to appear before the House Judiciary Committee.
Pelosi said Monday the attorney general or any other witnesses can't "tell the committee how to conduct its interviews."
She added "The attorney general of the United States is not the president's personal lawyer, and he should act as the attorney general of the United States and honor his responsibilities."
A redacted version of Mueller's report was released to the public April 19. Democrats have subpoenaed the Justice Department for the full report and the underlying evidence.
The Associated Press contributed to this report.
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