R-N.C.; and Senate Intelligence Vice Chair Mark Warner, D-Va., hold a news conference on the status of the committee's inquiry into Russian interference in the 2016 election on Capitol Hill in Washington, DC, October 4, 2017.
Burr and the committee's vice chairman, Sen.
"We understand more about how our service was abused and we will continue to investigate to learn all we can".
Burr said the Russians had been "pretty darn successful" in fomenting chaos in the US political system.
The politicians said though they have reached no conclusion about whether the Trump campaign colluded with the Kremlin, their investigation has left no doubt about a multi-pronged Russian effort to meddle in American politics.
We're learning more about the investigation into Russia's 2016 presidential election meddling, and what role MI may play in it.
Burr said on Wednesday that the Senate panel had made several attempts to contact Steele and to meet him and "those offers have gone unaccepted".
"The committee continues to look into all evidence to see if there was any hint of collusion", Burr told reporters during a press conference regarding the status of the Russian Federation investigation Wednesday afternoon. Twitter officials have said they found about 200 accounts that seemed to be part of a Russian campaign to influence the 2016 presidential election, and cybersecurity firms have projected that number is higher.
Facebook didn't immediately respond to a request for comment on why it won't release the ads it said were created to stir division in the U.S. before and after the 2016 presidential election.
The news comes days after Department of Homeland Security officials told Wisconsin election officials that Russian-linked hackers unsuccessfully targeted the state's election systems in 2016. Google and Twitter have also been invited to testify.
Burr said that the committee was making substantial progress in various areas of investigation.
Washington has accused Russian Federation of meddling in the November 8 election, with United States congressional investigators launching a probe into alleged interference. "Congress and the Special Counsel are best placed to put these pieces together because they have much broader investigative power to obtain information from other sources".
"We haven't even had our hearing yet", he said.
Facebook chief security officer Alex Stamos, in a blog post written last month, said it found about $100,000 in ad spending from 2015 through 2017 linked to accounts that "likely operated out of Russian Federation". Burr and Warner said the government must be proactive ahead of next year's midterm elections.
Warner said that representatives from Twitter, Facebook, and Google have been invited to testify at a November 1 public hearing before the committee.