The purpose of this legislation, known as the "Stop Illegal Campaign Coordination Act," is to clarify and expand the rules regarding how certain campaign expenditures are treated under the Federal Election Campaign Act of 1971. The main objective is to ensure that expenditures made in support of a candidate or political party are considered coordinated if they align closely with the guidance or instructions provided by that candidate or party. Key provisions of the legislation include a new definition of what constitutes a coordinated expenditure.