how would you deal with a saboteur at work?

i was hired into a new job. next year i'm transitioning into a managing position. the fellow who is currently in that role is supposed to be training me. we were friends, he actually helped get me hired. now that i'm here, i get the feeling that he's doing some underhanded sabotaging. he leaves me off important emails, he doesn't let me know about meetings until the last minute. i asked to meet with him to go over job details, when i first moved to town and he kept blowing me off for weeks before we finally met.

what do you do in that situation? the funny thing is i don't even care for the position, but it's not something i can't really get out of.