hot potato
noun [ C ] uk/ˌhɒt pəˈteɪ.təʊ/ us/ˌhɑːt pəˈteɪ.t̬oʊ/
棘手的事情，麻烦事，烫手山芋
a problem, situation, etc. that is difficult to deal with and causes a lot of disagreement
The abortion issue is a political hot potato in the United States. 在美国，堕胎问题是一个非常棘手的政治议题。