What is the fine-grained topic of the following text: The first constitutional test of the new era will be answered less by Donald Trump than by Mitch McConnell (R-Ky.) and Paul Ryan (R-Wis.): namely, whether the congressional leadership delivers to the chief magistrate the news that Capitol Hill is not a subsidiary of the White House. Only return the topic.
Congressional leadership's response to the balance of power with the White House.