Failed presidential candidate and Arizona Senator, John McCain joined the majority of democrats in supporting the drive to curb firearm ownership.
President Barack Obama lashed out at the bipartisan group who thwarted his gun control effort.
Earlier on Wednesday, Postal Inspection Service said suspicious mail sent to the Phoenix office of U.S. Sen. Jeff Flake was tested and they found nothing dangerous or harmful.
Law enforcement authorities evacuated part of the building Wednesday after staff for the Republican senator came across mail that was stained with an oily substance.
The suspicious mail was delivered a day after a letter containing ricin was mailed to the office of a Mississippi senator. The Secret Service also says it has intercepted a letter addressed to President Barack Obama that contained a substance that tested positive for the poisonous ricin.