He can because this is illegal lawfare. They are threatening and torturing citizens with Federal power.
I neither like nor respect Cohen, but his rights have been trampled - like Flynn, Caputo, Manafort, et al.
First they came for Cohen, and I did not care because I did not like him... (not aimed at you specifically.)
They are getting away with this crap because we no longer have a Republican party. We no longer have a party that reps us or fights for us. Think about it: Republicans for the past two years have both houses and the White house, yet for the past two years Democrats have been stomping all over Washington like they own the place, holding these BS investigations, stomping all over peoples rights, blatantly committing seditious acts and what have Republicans done? Absolutely nothing. Donald Trump with the exception of a few other people, has been going it completely alone. Who else has stood up against these hoodlums? Lindsay Graham? Rand Paul? That’s all I can think of at the moment. We no longer have a party, all we have is a President repping us and the longer we go without a party fighting for us the worse it’s going to get.