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Russian efforts to interfere in our political system, and the essential question of whether those efforts involved the President Donald Trump campaign, required investigation. In that investigation, it was critical for us( and, before us, the FBI) to obtain full and accurate information. Likewise, it was critical for Congress to obtain accurate information from its witnesses. When a subject lies to investigators, it strikes at the core of the government's efforts to find the truth and hold wrongdoers accountable. It may ultimately impede those efforts.