Answer: Equal time rule.
Explanation:- The equal time rule specifies that broadcasters are to provide equal access to the airwaves to all legally qualified candidates for a given political office during electoral campaigns. The rule requires U.S. radio and television broadcast stations to offer equivalent opportunities to all political candidates who requested it. For instance if a radio or television station sells an airtime to a political candidates , they are required to also sell to an opposing candidates that request to buy also.