Story highlights Ruben Gallego and Dan Gross: We have seen too many mass killings from guns this summer

Attorney General Loretta Lynch should lead a national effort to identify, reform, and prosecute "bad apple" gun dealers

Ruben Gallego is U.S. Representative for Arizona's 7th congressional district. Dan Gross is president of the Brady Campaign and Center to Prevent Gun Violence. The opinions expressed in this commentary are solely those of the authors.

(CNN) Charleston, South Carolina. Chattanooga, Tennessee. Lafayette, Louisiana. What do they have in common? Deaths of innocent people from guns.

For many Americans, the profound sadness of mass killings this summer in these cities is compounded by the frustrating sense that these events are being met with nothing more than hand-wringing and empty rhetoric.

This kind of bloodshed has become an accepted fact of American life, facilitated by an irresponsible corporate gun lobby and too many politicians, particularly Republican leadership in Congress that refuses to do the will of the American people. Yet, despite the polarizing politics that define this issue, there is still much that can be done to address the scourge of gun violence in America.

Dysfunction in Washington is no excuse for inaction in our cities, towns, states and communities. With 89 Americans killed every day by guns, and another 300 injured , we must act now to dramatically reduce gun injuries and deaths in America.

The time has come for responsible gun sellers to become stronger partners in the fight against gun violence, and for federal authorities to crack down on dishonest, irresponsible, and criminal gun dealers.

Read More