A shooting at Donald Trump‘s rally in Pennsylvania is being investigated as an attempted assassination of the former president and presumptive Republican nominee, law enforcement officials say. South Carolina Rep. Nancy Mace joins "The Hill Sunday" to discuss the political implications of the attack, saying the Republican National Convention will need to take on a "unifying tone" in the wake of the assassination attempt. #TrumpRallyShooting "The Hill Sunday" with Chris Stirewalt features honest, informed conversations to help viewers be better neighbors, better Americans, and fulfill their own obligations as American citizens. Sundays at 10a/9C. NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij