He also made a call for action to change gun laws, stating on Twitter that "Automatic weapons aren't needed to hunt deer or ducks; they're meant to kill people." In response to the shooting, Cardin sponsored Dianne Feinstein's proposal to ban bump-fire stocks, which were used by the shooter to kill 58 individuals and injure over 500. In July 2019, Cardin and Rob Portman introduced the Fallen Journalists Memorial Act, a bill that would create a new memorial that would be privately funded and constructed on federal lands within Washington, D.C. in order to honor journalists, photographers, and broadcasters that have died in the line of duty. In the 111th Congress, Cardin helped secure dental benefits in the State Children's Health Insurance Plan. In August 2019, Cardin was one of nineteen senators to sign a letter to United States Secretary of the Treasury Steve Mnuchin and United States Secretary of Health and Human Services Alex Azar requesting data from the Trump administration in order to aid in the comprehension of states and Congress on potential consequences in the event that the Texas v. United States Affordable Care Act (ACA) lawsuit prevailed in courts, citing that an overhaul of the present health care system would form "an enormous hole in the pocketbooks of the people we serve as well as wreck state budgets". In October 2019, Cardin was one of twenty-seven senators to sign a letter to Senate Majority Leader Mitch McConnell and Senate Minority Leader Chuck Schumer advocating for the passage of the Community Health Investment, Modernization, and Excellence (CHIME) Act, which was set to expire the following month. The senators warned that if the funding for the Community Health Center Fund (CHCF) was allowed to expire, it "would cause an estimated 2,400 site closures, 47,000 lost jobs, and threaten the health care of approximately 9 million Americans." In April 2019, Cardin was one of forty-one senators to sign a bipartisan letter to the housing subcommittee praising the United States Department of Housing and Urban Development's Section 4 Capacity Building program as authorizing "HUD to partner with national nonprofit community development organizations to provide education, training, and financial support to local community development corporations (CDCs) across the country" and expressing disappointment that President Trump's budget "has slated this program for elimination after decades of successful economic and community development." The senators wrote of their hope that the subcommittee would support continued funding for Section 4 in Fiscal Year 2020. On 31 October 2011 Cardin endorsed the proposal for the United Nations Parliamentary Assembly (UNPA). He is one of only six persons who served as members of the United States Congress ever to do so and is the only one who did so while in office.