The cover up is worse than the original crime. When the president conspires with others in government to lie to the American people and claim "national security" as a defense, the congress has a duty and precedent to get to the truth. Lying to the America people and ordering subordinates to lie in a cover up attempt is historically recognized as high crimes and treason and IS definitely an impeachable offense. When the president of the United States commits high crimes and treason and then lies to the American people and conspires to hide it from congressional investigators and claims...