What is the fine-grained topic of the following text: CBO last month said that if President Trump followed through on his threat to cut federal cost-sharing subsidies, silver plan premiums would rise by an average of 20 percent next year and, as a result, the federal deficit would climb by $194 billion through 2026 as the cost of government tax credits increased along with the rising premiums. Only return the topic.
Impact of potential cut to federal cost-sharing subsidies on silver plan premiums and federal deficit.