No big deal. You see this in newspapers all the time, the editor decides there is not enough contrast between subject and background, so he takes PS and blasts in “contrast” to make the subject stand out. If that was done in this case it was a sloppy job (or a deliberate attempt for a halo, like during the campaign).
If it is a light behind his head, it’s wall-mounted. Usually, a light that close will not make a “halo” when you put something in front of it. Bright lights far away scatter light along the path, which shows up when you shadow the light itself.
It would be nice if there were more pictures from the same event.
Would just blasting the contrast create those marks under his eye..the ones on his forehead..and the marks on the front of his forehead that look like they had a shaky hand when creating the halo and got white on it.