hot potato 
noun informal
A controversial issue or situation which is awkward to deal with: dog registration has become a political hot potato...
- The play deals with the hot potatoes of race, madness and power and dazzles with a story as funny as it is provocative.
- The issue has been a hot potato on my radio show this week.
- The issue has become a political hot potato for Bloomberg, who faces a tough battle for re-election next year.
- split end
- split hairs
- split-half
- split image
- split infinitive
- split-level
- split one's sides (also split a gut)
- split pea
- split-personality disorder
- split-phase
- split pin
- split-rail
- split ring
- split run
- split screen
- split second
- split shift
- split shot
- split stuff
- splitsville
- splitter
- split the difference
- split the ticket (or one's vote)
- split the vote
- split time