have a say in

Also, have a voice in. Have the right or power to influence or make a decision about something. For example, I want to have a say in this matter, or Citizens want to have a voice in their local government. [c. 1600]

have one's say. Express one's views, as in As soon as I've had my say I'll sit down. [Late 1600s]

have the say. Be in command, as in The general has the say over which troops will be sent. [Early 1800s]