Trump has already committed a crime, he has obstructed justice, and continues to do so.
1. That is the biggest hunk of nonsensical bullshit I have ever heard.
2. Assume that he has obstructed justice in the performance of his constitutionally enumerated executive duties. How is that the continuance or furtherance of a crime, justifying the seizure of his confidential communications? And if you tell me that he continues to obstruct justice, I want some specifics.
Was firing Comey obstruction? (it wasn't) That is a singular past act. Crime-fraud does not apply
Was it refusing to turn over documents in the investigation? (it wasn't) Reports I have seen indicate that Cohen was cooperating with authorities. That's why this raid was such a shock.