Senate Democrats are asking the Centers for Disease Control and Prevention (CDC) how research is coming on gun violence.

Democratic Sens. Ed Markey (Mass.), Charles Schumer (N.Y.), Kirsten Gillibrand (N.Y.), Richard Blumenthal (Conn.) and Brian Schatz (Hawaii) sent a letter to CDC Director Tom Frieden on Friday asking for a progress report on the current state of research at the agency on the causes and prevention of gun violence.

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