What is the fine-grained topic of the following text: A TV ad targeting Senators Susan Collins, R-Maine, and Lisa Murkowski, R-Alaska, claims the GOP has “a plan to install a Supreme Court justice who will overturn” protections for people with serious health problems and “take us back to a time when insurance companies could deny you coverage.” It warns viewers that “130 million Americans” could be dropped. Only return the topic.
A TV ad claiming the GOP's plan for a Supreme Court justice could threaten healthcare protections.