Congressional shouting match highlights America's gun divide after Nashville school shooting.

Two US congressmen got into a shouting match outside the chamber over gun control reforms following the Nashville elementary school shooting that killed six people. Democrats have proposed a bill to boost research into the causes of gun violence, while Republicans have dismissed calls for further reform. Meanwhile, hundreds gathered for a candlelight vigil in Nashville to remember the victims, and law enforcement officials continue to seek a motive for the shooting.