He added that he still hoped the investigation would be completed this calendar year.
Three sources with knowledge of Mueller's probe said his investigators have assumed control of multiple inquiries into allegations by US intelligence agencies that Russian Federation interfered in the election to benefit Trump, a Republican.
He said the panel has conducted more than 100 interviews lasting more than 250 hours in its nine-month-old investigation, and "we now have booked for the balance of this month 25 additional interviews". The panel has sifted through emails, text messages, highly classified intelligence reporting, and more.
Washington has accused Russian Federation of meddling in the November 8 election, with USA congressional investigators launching a probe into alleged interference.
Pointing to what has so far been revealed about Russia' social media activity, Burr added that, "there's no way that you can look at that and say that was to help the right side of the ideological chart, and not the left or vise versa". But he stressed that the panel has not yet released concrete, sealed results of the probe. "There is general consensus among members and staff that we trust the conclusions of the ICA, but we don't close our consideration of it in the unlikelihood that we find additional information".
Dozens of intelligence and political officials have been interviewed since the investigation began in January. "They've been unbelievably cooperative".
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"At the end of the day it's important for the American people to see these ads", said Warner.
The Senate intelligence committee has said it has confidence in an USA agency finding earlier this year that Russian Federation intervened in the U.S. presidential election in an effort to skew the vote in Donald Trump's favour. "If somebody has come in and not been truthful with us, we will catch them on that, and they will come back".
On Wednesday, the Senate panel's chairman Richard Burr told reporters that the issue of whether Trump's campaign colluded with Russian Federation remains an open question.
Shortly after he said that, a Facebook source told CNN that the company has not changed its position, either, and it will not be releasing the ads.
The dossier accuses the Trump campaign of conspiring with Russia, and it asserts that Russian intelligence agencies have information about Trump's participation in sexual escapades in Moscow, something Trump has denied. "We've got a tremendous amount of documents still to go through".
Burr also commented on the committee's investigation of memos written by former FBI Director James Comey after various meetings with Trump that critics said showed obstruction of justice on the part of the president, who fired Comey amid an FBI investigation of collusion by Trump. The committee plans to hear open public testimony from Facebook, Twitter and Google on November 1 pertaining to their role in selling political ads to Russian government entities and fostering an environment in which shadowy foreign-funded political propaganda efforts could thrive.