Recently there have been several posts about the tragic consequences of thyroid impacting on pregnancy. So the publication of the 2017 Guidelines (link below) is possibly particularly timely.
The reaction to these updated guidelines might not be a unanimous chorus of approval - but as a resource to back your arguments it really could be useful.
2017 Guidelines of the American Thyroid Association for the Diagnosis and Management of Thyroid Disease during Pregnancy and the Postpartum