MNP caught up with the award-winning international journalist to talk about her experience moderating another ANC forum.
While running as an independent candidate, Manicad will have the backing of Sara Duterte's Hugpong ng Pagbabago party.
In a statement, the Kapuso anchor said he is currently being treated for kidney disease and will also undergo a heart bypass surgery in mid-September.
Mayrina replaces former newsman Jiggy Manicad.
The anchor swap will be just among the changes at the local CNN station this third quarter of 2018.
The Kapamilya news channel's coverage, which lasted for more than 17 hours, was seen as the "most consistent” among the networks.