This letter urges Senators to vote no on two amendments to H.R. 2578, the Commerce, Justice, Science, and Related Agencies Appropriations Act, 2016: Cornyn Amendment 4749 and Feinstein Amendment 4720. Our concerns about both amendments are informed by our policy on the regulation of firearms, as well as our knowledge of the overbreadth and misuse of watchlists, and are twofold: the use of vague and overbroad criteria and the lack of adequate due process safeguards.