WASHINGTON — The House Judiciary Committee authorized its chairman on Wednesday to use a subpoena to try to force the Justice Department to give Congress a full copy of Special Counsel Robert S. Mueller III’s report and all of the underlying evidence used to reach his conclusions.

The chairman, Representative Jerrold Nadler of New York, said he would not immediately issue the subpoena. But the party-line vote won by Democrats who control the committee ratchets up pressure on Attorney General William P. Barr as he decides how much of the nearly 400-page report to share with lawmakers.

“I will give him time to change his mind,” Mr. Nadler said in his opening statement. “But if we cannot reach an accommodation, then we will have no choice but to issue subpoenas for these materials.”

The committee also approved subpoenas for five former White House aides who Democrats said were relevant to an investigation into possible obstruction of justice, abuse of power and corruption within the Trump administration.

They included Donald F. McGahn II, a former White House counsel; Stephen K. Bannon, the president’s former chief strategist; Hope Hicks, a former White House communications director; Reince Priebus, the president’s first chief of staff; and Annie Donaldson, a deputy of Mr. McGahn.

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