DIANNE FEINSTEIN (D-CA): "Mr. President, I'm sure background checks will stop many would-be murderers, but they would not have prevented Newtown. The weapons were legally purchased by his mother. And while he was disturbed, he had no criminal record or record of mental illness and would not have been subject to a background check because his mother gave him these weapons. Let me be clear: universal background checks are very important. I strongly support them, but they would not have prevented the tragedy in Newtown."