President Donald Trump's pre-election headquarters, his former head, Paul Manafort, and the son of the head of state, Donald Trump Jr., began transmitting documents on the alleged interference by Russia in the last year presidential election to the Senate committee, Bloomberg reported.

About 20,750 pages of documents were submitted to the Senate Judiciary committee

According to the representative of the committee George Hartman, Trump campaign passed about 20,000 pages of documents and Manafort provided about 400 pages on August 2. On August 4, Trump Jr. also presented 250 pages. According to the agency, in July the Senate Committee asked them to start preparing the materials before August 2.

The Judiciary committee also asked to provide the information regarding Trump Jr. meeting with Manafort, senior adviser of Trump Jared Kushner and the Russian Lawyer Natalia Veselnitskaya. They also said to submit the information collected from the Russian government about Hillary Clinton.

Earlier Bloomberg reported that the eldest son of the President Trump Jr. and the former head of the Trump electoral district, Paul Manafort, agreed to provide information to the Senate Judiciary Committee and to answer the questions of the senators privately before the July 26 hearing. Last week, Dianne Feinstein ( senator from California) said that the public hearings with Manafort and Trump Jr. maybe started in September.

A 35-page dossier was written by the British MI6 intelligence officer which contains the collusion between Trump and his campaign and Russian meddling in the 2016 elections.

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The committee also wants to investigate the role of fusion GPS (strategic intelligence firm based in Washington) in creating the dossier. The chairman of the committee Chuck Grassley said last week that maybe Russians paid for the dossier.

Trump Jr. meeting with Veselnitskaya, Manafort, and Kushner

On July 9, Trump Jr. made a statement that he met with Russian lawyer, Paul Manafort, and Jared Kushner, and they discussed the adoption of children from Russia in the United States. He added that he was invited to a meeting through acquaintances and he did not know the name of the person with whom he was going to talk.

The New York Times wrote that Veselnitskaya had declared compromising on Hillary Clinton. However, Trump Jr. said, no details or additional information were provided and not even offered, it quickly turned out that she did not have any relevant information.