Former President Donald Trump’s payroll attorney William Brennan launched into a tirade on MSNBC Thursday attacking Michael Cohen, the ex-Trump lawyer who is serving as the final and most significant witness for the prosecution in the former president’s Manhattan criminal hush money trial, saying he wasn’t to be trusted. However, MSNBC anchor Ari Melber, himself an attorney, stopped him cold with a simple point. “This guy is a whiner,” said Brennan. “It’s always somebody else’s fault. I think [Trump defense counsel Todd] Blanche brought that out. Today it’s the judge’s fault, it’s the prosecut…