Make player face same direction as camera

My player controller script has the player move in the direction the camera is facing, but only when I press forward/backward. I'm wanting the player to constantly face the same direction as the camera (left & right only), but can't seem to figure out a way to do it.

This is in my update method:

         Vector2 input = new Vector2 (Input.GetAxisRaw ("Horizontal"), Input.GetAxisRaw ("Vertical"));
         Vector2 inputDir = input.normalized;
 
         if (inputDir != Vector2.zero) {
             float targetRotation = Mathf.Atan2 (inputDir.x, inputDir.y) * Mathf.Rad2Deg + cameraT.eulerAngles.y;
             transform.eulerAngles = Vector3.up * Mathf.SmoothDampAngle(transform.eulerAngles.y, targetRotation, ref turnSmoothVelocity, turnSmoothTime);
         }
 
         bool running = Input.GetKey (KeyCode.LeftShift);
         float targetSpeed = ((running) ? runSpeed : walkSpeed) * inputDir.magnitude;
         currentSpeed = Mathf.SmoothDamp (currentSpeed, targetSpeed, ref speedSmoothVelocity, speedSmoothTime);
 
         transform.Translate (transform.forward * currentSpeed * Time.deltaTime, Space.World);
 
         float animationSpeedPercent = ((running) ? 1 : .5f) * inputDir.magnitude;
         animator.SetFloat ("speedPercent", animationSpeedPercent, speedSmoothTime, Time.deltaTime);