Secretary of Homeland Security Kristi Noem said that authorities believe the suspected shooter who they say opened fire on National Guardsmen in Washington, D.C., last week might have been radicalized after he arrived in the United States. Sen. Chris Van Hollen, D-Md., said Sunday he believes "it's very possible there was a war crime committed" in the administration's first strike against an alleged drug trafficking boat in the Caribbean Sea in September. Roundtable: Former DNC chair Donna Brazile, former New Jersey Governor Chris Christie, Democratic strategist Faiz Shakir, and communication analyst and pollster Frank Luntz.