Master P ain't a politician, but he's lobbying the peeps who run H.S. basketball in Minnesota ... pleading with them to change a rule that limits players from crossing state lines to hoop.
TMZ Sports got P -- and his star 17-year-old H.S. hoops playing son, Hercy Miller -- in Beverly Hills on Tuesday ... and we asked them about the younger Miller's basketball career.
P tells us Hercy's Minnehaha Academy squad is killin' it (they beat Bronny James' Sierra Canyon team a few weeks back) .