I'm not sure why James never contacted Dr Ehrman but if he's serious and he was not just offering a load of bluster for his followers who make up his echo chamber one would expect him to be rushing to email Dr Ehrman to set this debate up. Considering Dr Bart Ehrman called James White offensive and not a nice chap I think James would do well to take some of Sam Shamoun's advice to ensure the interaction, this time round, goes off smoothly and yields a meaningful dialogue without any negative baggage and resentment.
This is the type of argument James White would expect to come up against in a debate on the theology of the New Testament authors from Dr Bart Ehrman.
How Jay Smith, Nabeel Qureshi, Sam Shamoun and David Wood Contriubute to the Apostasy of Christians
A Question of James White's Consistency Re Prof. JR Daniel Kirk and Bart Ehrman
Was Ignatius Trinitarian: Rudolph Boshoff, James White + Jonathan McLatchie (Muslim Responds)
Muslim Helps James White out: Why Bart Erhman Finds James White Offensive
The Lying Hand of the New Testament Scribe
The Lying Hand of the New Testament Scribe