From here:
Trump’s fraud trial rattled by witness’s possible perjury deal
'Arthur Engoron, the judge presiding over the case, sent an email to the trial’s lawyers on Monday asking them to give him more information about a
supposed perjury deal that Allen Weisselberg, a former Trump Organization executive, is making with the office of the Manhattan district attorney, Alvin Bragg.
In his email, Engoron said he wanted to know whether Weisselberg “is admitting he lied under oath in my courtroom at this trial”. “Although the Times article focuses on the size of the Trump Tower Penthouse, his testimony on other topics could be called into question.”
Engoron said he might use such a perjury admittance to “invoke
falsus in uno”, meaning he would judge Weisselberg’s entire testimony as not credible. Engoron asked lawyers from the attorney general’s office and from Trump’s team to detail “anything you know about this that would not violate any of your professional ethics or obligations” along with how the lawyers think Engoron should “address this matter, if at all, including the timing of the final decision”.
He gave them a 7 February deadline.'
More rats deserting the the sinking ship.