Wheaton should be able to hire/fire anone they want. What's the issue?
The bigger question, however, is this: can evangelical Christian colleges such as Wheaton (which has the reputation of being the "Evengelical Harvard," a reputation which they want to foster) seriously claim to be teaching philosophy and history, for instance, if they fire admitted believers who simply adhere to another faith-tradition? Especially in the arenas of philosophy and Christian history, there can be no serious scholarship without interacting with Catholic scholarship.
* In rejecting protestantism and converting to Catholiciism, isn't he a LDP (Latter Day Protestant)? In becoming Catholic he is fully in line with "biblical doctrine that is consonant with evangelical Christianity" properly understood.
See EVANGELII NUNTIANDI by Pope Paul VI
I agree and I am Catholic.