H. Rept. 116-188: Securing the Homeland Security Supply Chain Act of 2019, Report to Accompany H.R. 3320, Including Cost Estimate of the Congressional Budget Office, August 27, 2019 [open pdf - 497KB]
From the Purpose and Summary: "The purpose of H.R. 3320, the 'Securing the Homeland Security Supply Chain Act of 2019,' is to provide the Secretary of Homeland Security with the authority to restrict certain procurements related to information technology and associated products if, following a risk assessment, it is determined the vendor poses a threat to the Department of Homeland Security supply chain. If such a determination is made, the Secretary is permitted to limit the amount of information disclosed about the decision-making process."
H. Rept. 116-188; House Report 116-188
Government Publishing Office: http://www.gpo.gov/