This has been discussed a ton on here. I doubt it's true, and even if there is some "tension", the Spurs are doing well without him and would understandably be legitimate contenders once he returned (along with Gay).
BUT... I'll play along.
Trade would have to be Morris, Brown, Rozier + Yabusele, then Lakers/Kings Pick + 2019 First Rounder, all for Kawhi Leonard.
Matching salaries is a bit difficult, and so you'd have to deal those 4 players (or Brown + Tatum + scraps, but Tatum should be untouchable IMHO unless it's for Greek Freak or Durant lol).