The U.S. Senate will vote on four gun control measures Monday, although none are expected to pass.
The amendments, two proposed by Democrats and two by Republicans, deal with the terrorist watch list, background checks and mental illness.
The amendment proposed by Democratic Sen. Dianne Feinstein would ensure the attorney general is notified if someone who's been investigated for terrorism in the previous five years tries to buy a firearm. Under the amendment, the attorney general would have the authority to deny a weapon purchase if there's "reasonable suspicion" the purchaser is likely to commit terrorist acts.
The seemingly competing amendment sponsored by Republican Sen. John Cornyn calls for the immediate notification of the attorney general and law enforcement when someone who's been investigated for terrorism in the previous five years tries to buy a firearm. The attorney general could delay the gun purchase for up to three days and petition the courts to prevent the sale based on probable cause.
Another measure proposed by Democratic Sen. Chris Murphy would make firearms sales at gun shows and on the internet subject to background checks. A proposal by Republican Sen. Chuck Grassley clarifies the terminology for firearms restrictions for those with mental illnesses and also increases funding for the National Instant Criminal Background Check System.
The votes come days after Murphy's nearly 15-hour filibuster seeking a vote on the Democratic measures.
His push for gun control reform was renewed after a gunman killed 49 people and injured 53 others at a gay nightclub in Orlando.
Many political reporters are skeptical that any of the amendments will pass, since similar measures have failed as recently as this past December after the San Bernardino shooting in which 14 people were killed.