re: Trump Trial: Judge Merchan won't allow certain Defense testimony

From what I read, the expert is being allowed to testify to what the Federal Election Commission is, its purpose, background, what laws if any it is responsible for enforcing and general definitions and terms. The defense wanted to expand the testimony, but I don’t know what they expected him to cover(although they stated it was the same subject matter that Smith was not allowed to testify on in the case against Sam Bankman- Fried)