11 myths about the future of gun control, debunked after the Charleston shooting

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3. A partial solution.

.. In the Navy Yard {DC} incident, the shooter legally purchased firearms in neighboring Virginia despite a criminal record and mental health issues – exposing gaps in the current background checks system. And cities like Chicago are plagued by the illegal trafficking of firearms; there is no current federal law that defines gun trafficking or straw purchasing as a crime.

When guns are bought and sold cross state lines, that involves interstate commerce and that allows the Federal government to be involved. Guns flow from states with poor gun regulations to those with stronger regulations. It is highly doubtful those guns are being given away.
There is no reason why the federal government cannot implement uniform firearm regulations across all the states. Enforce them by requiring all firearms to be bought or sold through federally registered dealers. The lack of such uniform regulations because of the so-called 'States Rights' on this issue, is a very big problem.