Former President Donald Trump’s attorney needs to be brought to heel by Judge Juan Merchan before Michael Cohen takes the stand, warned former Manhattan-based federal prosecutor Kristy Greenberg in an MSNBC article Friday. Specifically, there is a strong risk that when Cohen, the former attorney and fixer at the heart of Trump’s alleged hush payment scheme being prosecuted as business fraud, takes the stand, Trump attorney Todd Blanche will defy established orders from the court and try to bring up evidence already ruled out of order, she said. And Merchan should make clear to him just how sev…