This idiom or expression like phrase means:

A radio and/or television personality who shocks audiences with controversial material.

This idiom or expression means:

A touchy, sensitive, or controversial issue or subject.

Oil has become as much a hot-button political issue as health care.

This idiom or expression refers to:

A controversial issue.
A risky thing to handle.
Something nobody wants.
Something nobody wants to handle, or get involved with.

A. Why do they call it “Hot potato”?
B. Try holding a hot potato in your hands, then you’ll know!!!