CDC reference circumcision-for-STI-prevention in screening of immigrants. Comments needed by 24 Aug. 2015.

Link here. There is a blue 'Comment Now' button in the top right-hand corner of the screen. You can upload documents if 5000 characters in insufficient space.

Excerpt (emphasis added):

'Internationally, most countries do not track any of the three infections; however, the few publications and records available suggest case rates have declined worldwide over the past 50 years. Declining rates of these conditions are likely due to a variety of factors. Improved living conditions, better sanitation (e.g., availability of soap and water), condom use, and educational efforts are all believed to be important factors (6, 21-23) contributing to the decline in the incidence of these infections. Improved recognition by physicians and treatment based on clinical presentation of sexually transmitted infections, coupled with treatment of sexual partners, also appears to be important in their decline. Increased antibiotic usage for treatment of other unrelated conditions may have contributed to the declining incidence of these infections. Additionally, HIV prevention strategies such as male circumcision may be playing a role, although definitive studies of this effect are still pending.

Given the low burden of these three infections globally, the potential introduction of additional cases into the United States by aliens is likely to have a negligible impact on the U.S. population for several reasons.'

We have several threads over at F-R.net tagged skepticism which might be helpful for researching and drafting a response.