The Orlando shooting Sunday left many trying to figure out why the tragedy occurred and what can be done to stop it.

In an effort to get lawmakers to move forward on gun control efforts, Democratic Sen. Chris Murphy of Connecticut – aided by several other senators of his party, including Elizabeth Warren of Massachusetts, Cory Booker of New Jersey and Richard Blumenthal of Connecticut – seized the Senate floor and was refusing to relinquish it until "we get some signal, some sign that we can come together."