Neither Judiciary Committee Chairman Jerry Nadler, D-N.Y., nor intelligence committee Chairman Adam Schiff, D-Calif., had addressed the timing directly as of Friday morning.
During his last day on the special counsel, Mueller stated that he did not want to appear before Congress. Around 80 Democrats have said they think an impeachment inquiry should be launched to bolster their efforts, but House Speaker Nancy Pelosi has so far rebuffed those calls.
Rep. Pramila Jayapal said it would be "ideal" if all members were able to ask their questions.
American media had reported earlier on Wednesday that some committee members viewed the originally planned sessions as too short.
"This report is my testimony", Mueller had said.More news: HILL HOUSE Star Oliver Jackson-Cohen Is Your New INVISIBLE MAN
"The House Judiciary Committee will convene on July 24 at 8:30 a.m. with Special Counsel Mueller testifying in public for three hours", the statement continues.
Both a senior congressional official and a Justice Department official confirmed to the New York Times that the department had told the two deputies, Aaron Zebley and James L. Quarles III, that it did not want them to talk to the House committees investigating President Donald Trump.
Pushing back his appearance will give Mueller more time for questioning.
The official, who declined to be named to discuss the confidential negotiations, said that the committee had recently heard nearly five hours of testimony from another member of Mueller's team.
However, it remains unclear why the House committees decided Friday to delay Mueller's testimony.More news: Finsbury Works Reckitt's Record $1.4B Opioid Deal - Thu., Jul. 11, 2019
But Democrats insisted they needed to hear from Mueller, in order to bring to life the dense 448-page report on Russian election interference and possible obstruction of justice. Their desire set off months of negotiations that ultimately led to Mueller agreeing to appear, under subpoena, for a limited time period.
Many members of the Judiciary Committee were concerned that two hours is insufficient time to discuss even half of the 10 areas of potential obstruction of justice by Trump identified in the Mueller report. "I'm not privy to these discussions", said Rep. Jamie Raskin, Maryland Democrat.
The questions surrounding the hearing threatened to distract from the Democrats' intended goal: highlighting the contents of Mueller's 448-page report for Americans who they believe have not read it.
That means the committees may have to go through a lengthy court process to get more information.More news: Social media personality arrested for sexual assault, police say