A long-awaited report on alleged Russian interference in the 2017 general election and the Brexit 2016 vote will be published next week.
The intelligence and security committee voted unanimously to be released before Parliament's summer break.
The delay in publishing the report, which was completed last year, has led to speculation that it contains embarrassing details for conservatives.
But the government denies that political considerations were involved.
The report is expected to examine a wide range of Russian activities - from traditional espionage to subversion - but the greatest interest is the possible interference in the 2016 and 2017 votes.
Downing Street gave the go-ahead for publication last fall, but this was hampered by the December general election and therefore by a delay in setting up the committee, which meets behind closed doors.
What's in the Russia report?
By Gordon Corera, security correspondentEspionage, subversion and influence: this is Russia's report. To what extent has Russia carried out these activities and has enough been done to stop them?
It's not just about the traditional collection of spy versus spy information to steal secrets, but also about Russia's use of new techniques like cyber espionage and social media campaigns to interfere in political life.
But it is also about Russian influence, especially through money, which critics claim has penetrated public life and compromised various institutions.
The information in the report came from intelligence agencies but also from independent experts. Some of them are believed to have painted a clear picture of a long-term failure to dissuade Moscow, until Alexander Litvinenko's weak response to poisoning with radioactive polonium in 2006.
How many details are there and how harmful is it? We are going to find out.
The nine-member ISC's decision to present the report follows the election of Julian Lewis, Tory member since 1997, as president on Wednesday.
He showed up for the role, apparently against the wishes of Downing Street, which had preferred Chris Grayling for the job.
The three Labor members and a member of the SNP committee supported Mr. Lewis, who was expelled from the Conservative Parliamentary Party shortly after being appointed president.
But in a statement, Lewis, a New Forest East MP, said that the 2013 Justice and Security Act had "explicitly removed the prime minister's right to choose the president of the SAI and turn him over to committee members."
He added: "It was only yesterday afternoon [Thursday] that I received a message asking me to confirm that I would vote for the prime minister's favorite candidate for the president of the ISC.
"I didn't respond because I considered it an improper request. At no previous stage did I make a commitment to vote for a particular candidate."
Lewis also said that the government denied that he wanted to "parachute" a favorite presidential candidate, adding: "It is therefore strange to have the whip removed for not voting for the government's favorite candidate."
But House of Commons leader Jacob Rees-Mogg accused him of "playing goslings and dragons with the Labor Party" and said that was why he had withdrawn the conservative whip.
However, Conservative MP Peter Bone said Lewis was "exceptionally well-qualified" to become president and "would do and do a great job", while some on Downing Street had had a "huge whistle".
And Labor leader Sir Keir Starmer said it was "positive" that the committee chose Lewis.
He added: "Obviously they have chosen to refuse the imposition by the Prime Minister of their favorite president on them ... They are an independent committee and we should respect the decision they have taken."
