(FILES) This file photo taken on June 13, 2016 shows people gather to protest gun violence and call for sensible gun laws outside the White House in Washington, DC. The Republican-controlled US Senate rejected four competing gun control measures June 20, 2016 just days after the Orlando club massacre, highlighting the partisan feuding over an issue set to resonate during a heated presidential election year. With a month to go before Republicans and Democrats formally nominate their White House hopefuls, lawmakers failed to compromise on one of the most sensitive hot-button issues in America. Even as they sought to appear keen to take action following the deadliest mass shooting in US history that left 49 dead at a gay nightclub in Orlando a week ago, Republicans and Democrats voted down four amendments -- two from each party -- that would have limited some gun purchases, including those by suspected terrorists. / AFP PHOTO / MOLLY RILEYMOLLY RILEY/AFP/Getty Images