This apparently isn't the only time Cohen has changed parties. He was a registered Democrat before 2017 and this is his way of showing he puts country and family first.
Michael Cohen, President Trump's former attorney who until June served as the Republican Party’s deputy finance chair, today changed his party registration from Republican to Democrat, according to a knowledgeable source.
Between the lines: Cohen went online around noon to the Albany-based New York State board of elections to make the change, according to the source. The move fits a pattern of Cohen publicly breaking from the man for whom he once said he’d take “a bullet.”
Keep in mind that Cohen has been signaling his break with Trump for months now, after Trump didn't lift a finger to defend him from charges of campaign finance violations over Cohen's payments of hush money to keep two women quiet about their affairs with Trump.
In his guilty plea in August, Cohen implicated Trump by suggesting that the then-presidential candidate directed him to keep the affairs quiet.