This step is the latest in a series of disputes between the White House and Congress regarding Trump's behavior.
Last week, the president filed a federal lawsuit to block the receipt of the financial statements of his accountant by the House of Representatives, which is controlled by the legislators of the Democratic Party.
Muller completed an investigation into the “Russian case” in March. The special prosecutor came to the conclusion that Russia interfered in the 2016 US presidential election, and Trump benefited from this, but did not enter into an agreement with Russia.
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On April 18, the US Department of Justice published the full version of the Muller report. The document has almost 450 pages, some of which are hidden for reasons of secrecy – in particular, in the part where specific examples of Russia's intervention in the 2016 US presidential elections are described.