Sorry, this had been a long time, but has either the DOJ or FTC under any presidential administration ever reversed a previous merger allowed by another presidential administration?
Apparently, according to a person at superherohype forum, they just filed for approval in Argentina and its explained below:
https://forums.superherohype.com/threads/the-rebooted-keep-hope-alive-that-the-rights-can-revert-back-to-marvel-thread-part-24.544375/page-372#post-37488763
Well after the vote they would have to inform both Disney and Fox of course, and do to the issue of cable sports engulfing the issue in Mexico, then it would have to be newsworthy.