Can I remove framing members forming a wall below a load bearing beam?
It's highly unlikely that there's a full beam in that wall. There's probably a doubled 2x10 header over the opening. Plan on installing a 3-1/2" by 14" LVL beam (or steel) to span that distance (after talking to an engineer, of course).

You can remove studs under a load-bearing beam if the beam is designed for the resulting span(s) and the remaining studs (posts) are properly supported below.