Congress should establish an independent commission that has the staff, resources, and single-minded focus necessary to investigate this matter. Most important, as the events of this week demonstrate, an independent commission will be able to conduct it's work insulated from any political interference. Now the president believes this is an attempt to undermine his legitimacy or credibility, it is not.
Only the president is capable of doing that, and regrettably he is at great risk of doing so. During our hearing, Director Comey also testified that there absolutely no basis for the President's startling accusation that his predecessor had wire tapped him in Trump Tower. This was reveled to be utter nonsense.
When a president of the United States makes claims that are proved baseless, it weakens the presidency, and undermines our security and standing in the world. Presidential credibility once squandered may never be fully regained.