We already have a very capable close air support aircraft (CAS) in current inventory that has proved itself in combat. Just got to convince the powers to be that is it paid for, is getting re-winged by Boeing and does it's job very very well. No need to retire it.
It is called the A-10.
It can carry a butt-load of ordnance, and loiter around the target area for hours.
https://fas.org/man/dod-101/sys/ac/a-10.htm