After a gunman opened fire in a Lafayette, Louisiana movie theater last week, killing two people and injuring nine others, Republican presidential candidate Donald Trump is pushing back against repeated calls to strengthen gun control legislation. "These are sick people," Trump said of the shooter, John Russell Houser, who was reported to be mentally ill. "This has nothing to do with guns. This has to do with the mentality of these people." "I'm a big Second Amendment person. You need protection," the presidential hopeful added in a CNN interview Sunday. "This person from what I hear had a record of...