Its a state matter.....that relies on an attempt to bootstrap federal campaign finance laws. Because with just the state laws all they even arguably have is a business records complaint which is a misdemeanor AND the statute of limitations has run out on those claims anyway.
You are making the assumption that Bragg will tie the fraud to federal election law.
He may tie it to NY State election law, or, more likely, he will tie it to NY State income tax violations, specifically taking the payments to Cohen as a business expense on his tax returns for the Donald J Trump Revocable Trust and/or the Trump Organization.