Notifying legislators of initiative signature challenges.

SB 5048 requires Washington's secretary of state to notify the chair and ranking member of relevant legislative committees within five days whenever a challenge is raised about the number of valid signatures on an initiative petition. This procedural bill directly affects legislative committees by ensuring they are promptly informed of signature disputes. The key mechanism is the mandatory 5-day notification to committees after any challenge to an initiative's signature count is filed. The bill does not change initiative rules but standardizes communication between the secretary of state and lawmakers. (1 sentence, as it is procedural)