Just after midnight on Friday at a movie theater in Colorado, a heavily armed individual in body armor opened fire with an assault rifle, killing 12 and wounding 58. James Holmes purchased all of his ammunition and weapons legally, which begs the question: Could any kind of regulation or action have prevented this tragedy?

Democratic Senator Dianne Feinstein and Tea Party Senator Ron Johnson appeared on Fox News Sunday to discuss the violent event and how government should respond to it to prevent a similar tragedy from happening in the future.

Feinstein argued that it’s far too easy for anyone to get their hands on weapons and ammunition, even people who are unstable.