Cohen was Trump’s personal attorney and had been for several years. Years before Trump even decided to run for office.
And who cares how Cohen characterizes it, Cohen is an adjudged perjurer.
We aren't relying on how Cohen characterizes it. We now have the court docs so these are now the facts in evidence. Doesn't matter if Cohen used to be his personal attorney once he starts doing work for the campaign. Cohen left a paper trail. Cohen is going to jail and didn't get any leniency for cooperating.