As of my last update in January 2022, I cannot provide real-time updates or developments. However, based on the information available up to that point, it's important to note that legal disputes and challenges, especially those involving high-profile individuals like former President Donald Trump, can be complex and multifaceted.
If Trump's lawyer has stated that they will challenge Judge Engoron's definition of fraud, it suggests that there may be disagreement over legal interpretations, evidence, or procedural matters in a particular case or cases involving Trump.
Legal challenges and disagreements within the judicial system are not uncommon, and they are typically addressed through legal proceedings, appeals processes, and the presentation of arguments and evidence within the framework of the law.
For the most current information on this matter or any legal developments involving Donald Trump, I recommend consulting reputable news sources or legal analyses for the latest updates and insights.