Washington Attorney General Bob Ferguson Washington Attorney General Bob Ferguson

Sens. Edward Markey, D-Mass., left, and Richard Blumenthal, D-Ct., display a photo of a plastic gun Tuesday, as they call for President Trump to reverse an administration decision to allow a Texas company to make blueprints for a 3D-printed gun available online. Trump announced over Twitter that he is "looking into" the sale of 3D plastic guns to the public. Matthew Daly/AP hide caption

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Matthew Daly/AP

Washington state Attorney General Bob Ferguson, pictured in 2017, is leading a multistate lawsuit to prevent 3D-printer gun plans from being published online. Karen Ducey/Getty Images hide caption

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Karen Ducey/Getty Images

Washington state Attorney General Bob Ferguson addresses a news conference Wednesday in Seattle, announcing that his office is suing Motel 6. Elaine Thompson/AP hide caption

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Elaine Thompson/AP