Really?
Trump has made the accusation of a felony against Obama. Burden of proof lies with him
Trump has provided zero proof and is now demanding that Congress provide proof for him
Defamation Law: The Basics - FindLaw
Our government places a high priority on the public being allowed to speak their mind about elected officials as well as other public figures. People in the public eye get less protection from defamatory statements and face a higher burden when attempting to win a defamation lawsuit.
When an official is criticized in a false and injurious way for something that relates to their behavior in office, the official must prove all of the above elements associated with normal defamation, and must also show that the statement was made with "actual malice."
This meant, according to the Court, that public officials could only win a defamation suit
when the statement that was made was not an honest mistake and was in fact published with the actual intent to harm the public figure. According to the Court,
actual malice only occurs when the person making the statement knew the statement was not true at the time he made it, or had reckless disregard for whether it was true or not.
Sounds like what Trump did when he accused Obama of wiretapping the phones in Trump Tower, with no proof, and with the intent of harming Obama by accusing him of a crime.