Mr Mueller had been scheduled to testify on July 17 before two house committees about the findings of his Russian Federation investigation.
So one reason for a delay could be to permit more time for negotiations within Congress over the ground rules for the hearings.
The possible delay scrambles preparations across Washington for what's the one of the most high-profile hearings in years.
On May 29, in his only public comment since completing the report, Mueller said he had not exonerated Trump of obstruction of justice, but said Justice Department policy prevented him from charging the president.More news: Funeral held for ‘Dog the Bounty Hunter’ star Beth Champan
Mueller has said any such testimony would not go beyond his 448-page report. At 12:00 p.m. EDT the House Intelligence Committee will begin its hearing.
Under the new agreement, Mueller will appear before the Judiciary Committee for three hours. Under the tentative agreement, which was described to POLITICO by lawmakers briefed on the talks, the Judiciary Committee would be granted an extra hour to question Mueller.
Judiciary Committee ranking member Rep. Doug Collins, R-Ga., complained on Wednesday that the panel had been divided into "haves and have-nots".
"All members - Democrats and Republicans - of each committees could have a significant alternative to query the Particular Counsel in public, and the American folks will lastly have a chance to listen to instantly from Mr. Mueller about what his investigation uncovered", mentioned Judiciary Chairman Jerrold Nadler and Intelligence Chairman Adam Schiff. The statement said the postponement was "at his request". It said no collusion, and it said, effectively, no obstruction.More news: Geraint Thomas loses time to rivals after crash on Tour de France
Mueller's investigation did not find evidence of collusion between Russian Federation and the Trump 2016 presidential campaign.
Saying that Mr. Mueller has already made clear his conclusions, the president added, "You can only get so many bites at the apple". The committee is comprised of 24 Democratic members and 17 Republican members.
"I appreciate news the chairman has taken seriously the concerns Judiciary Republicans raised this week". But Democrats have had little success so far in their attempts to investigate, despite launching several probes, because the White House has blocked several witnesses from answering questions. And those on the Judiciary Committee who weren't in line to get questions were up in arms they might not get their shot to question Mueller with millions tuning in.More news: Police start probe of ambassador emails 'leak'
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