Idiomatic language is one of the hardest things to learn in a language because you might hear the words and understand each individual word, but have no idea that the words together have a different, idiomatic meaning. This is a phrase that could be used in IELTS Speaking.
The abortion issue is a political hot potato in my country.
Britain's EU membership is a political hot potato at the moment.
The migrant issue is a hot potato in Europe.