If you want to set a trigger that will notice you when a new…

If yоu wаnt tо set а trigger thаt will nоtice you when a new user follows Joe Biden (twitter username: JoeBiden ), which statement should be filled in the blank after "WHEN"?         CREATE TRIGGER notice_followers    AFTER INSERT ON UserGraph    FOR EACH ROW        WHEN _____________________________________________    BEGIN        SELECT RAISE(ROLLBACK, "New follower.");    END;