President Trump has gone to extraordinary lengths to conceal details of his conversations with Russian President Vladimir Putin, The Washington Post reports. The president's efforts include reportedly taking possession of the notes of his own interpreter and instructing the linguist not to discuss what had transpired with other administration officials. The unusual behavior part of a broader pattern by the president of shielding his communications with Putin from public scrutiny, and even preventing high-ranking administration officials from fully knowing what he has told Putin—one of the United States’ main adversaries. As a result, U.S. officials said there is no detailed record, even in classified files, of Trump’s face-to-face interactions with the Russian leader at five locations over the past two years. Special counsel Robert Mueller is believed to be in the final stages of an investigation that has focused largely on whether Trump or his associates conspired with Russia during the 2016 presidential campaign.