NEW YORK — With Donald Trump’s fixer-turned-foe Michael Cohen expected to take the witness stand Monday, the judge in the former president’s hush money case issued prosecutors a stern warning: Get Cohen to stop his taunting posts and jabs at Trump.

Judge Juan M. Merchan’s comments came as a dramatic and consequential week in the first criminal trial of a former American president drew to a close Friday. The prosecution could rest its case by the end of next week, prosecutor Joshua Steinglass said.