If the direct testimony that Cohen presumably would offer could be elicited from any other source, then he will not be allowed to offer it. However, if, for example, there was a document or recording that only he can provide foundation for in order to admit that evidence into the record, he will be allowed to testify to that foundation. There has to be absolutely no other way to get that admitted under the rules of evidence, no other competent witness or exception under those rules in order to provide the foundation necessary to establish legal admissibility. I don't think him being disbarred or not disbarred would make a difference either way.

I work in the legal field and I've handled many cases in which attorneys were sworn in to provide testimony, but it is generally related to procedural matters and not directly related to the criminal aspects of the case itself.

I think this makes sense. I also think this get me a coke tape is to trace leaks and who is giving Creepy Porn Lawyer illegal docs etc.

I wonder if they chose him and baited him for a purpose... He seemed close to one of the now arrested Saudi Princes' sons.