Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: A constitutional court is a high court that deals primarily with constitutional law. Its main authority is to rule on whether laws that are challenged are in fact unconstitutional, i.e. whether they conflict with constitutionally established rules, rights, and freedoms, among other things.

Question: A constitutional court's main authority is what?
rule on whether laws that are challenged are in fact unconstitutional