Okay, you used "leader" a couple of time too many. I think one (or both) of these statements answers your question:
A bounty hunter (leader or not) with authorisation can arrest a government leader in that government's own space.
A government leader can arrest a bounty hunter (leader or not) in that government's own space.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."