"Mueller's limited availability meant restrictions on the amount of time for some members to ask questions and also made it appear that some members wouldn't be able to speak at all", NPR reported. The statement said the postponement was "at his request".
"We are pleased to announce that Special Counsel Mueller will provide additional public testimony when he appears before our committees", Congressmen Jerrold Nadler, D-N.Y., and Adam Schiff, D-Calif., said in a statement Friday.
Mueller said because of longstanding Justice Department regulations that a sitting president can not be indicted, his team of investigators didn't consider trying to indict Trump.
Mueller has expressed his reluctance to testify and said he won't go beyond what's in his report.
However, lawmakers are banking on public testimony to reveal the contents of the report to Americans who have not read it. The former special counsel will testify for "an extended period of time" on that date, Nadler and Schiff said.
Democrats want to ask Mueller about his conclusions, including that he could not exonerate Trump on obstruction of justice after detailing several episodes in which Trump tried to influence the investigation.
Mueller's investigation didn't discover proof of collusion between Russian Federation and the Trump 2016 presidential marketing campaign.
On Thursday, Rep. Doug Collins, top Republican on the Judiciary Committee, praised the news of Mueller's scheduled testimony.
New Zealand's first gun buyback event a success
Licenced firearms owners have time until December 20 to surrender weapons that have now been deemed illegal under the scheme. Others at the firearms collection at Riccarton Racecourse said the process was simple, but were steadfast in disappointment.
In terms of obstruction of justice, Mueller declined to make a "traditional prosecutorial judgment" citing a Department of Justice policy to not charge a sitting president.
That led to Trump declaring that he had been fully cleared by the probe, while Democrats in Congress began calling for more investigations and impeachment, saying the report was evidence of criminal wrongdoing.
The Judiciary Committee also sought to interview former Mueller aides Aaron Zebley and James Quarles behind closed doors.
Robert Mueller won't be on capitol hill next week for testimony.
The official did not name that person.
One of the people said the hearing would be delayed a week.
The committees have not officially announced any format. The report was given to Attorney General William Barr for review in April. "We have been arguing for as much time as we can get".
Schiff's Intelligence Committee has 22 members, about equal to the number of Judiciary members who were initially expected to question Mueller.
"I have been elected just like anyone else here", said Arizona Rep.