The legislation it approved would make it harder for Mexican drug cartels to get their hands on guns sold in the United States and would punish those buying firearms or ammunition for criminals, said the committee's chairman, Sen.

CNN: Senate panel agrees to new legislation on guns

Washington, DC (CNN) -- A new bill would make it harder for Mexican drug cartels to get their hands on guns sold in the United States and would punish those buying firearms or ammunition for criminals, according to senators from both parties, who proposed the legislation.

CNN: Bipartisan bill would punish gun trafficking

They also say that after his access to the university was stopped, he "began a detailed and complex plan to obtain firearms, ammunition" and other equipment for the attack.

BBC: Aurora shootings: James Holmes 'threatened professor'