Senate Agriculture Committee member Sen. Kristen Gillibrand (D-NY) (L) and Sen. <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Joe+Donnelly&family=editorial&specificpeople=3269744 ng-click='$event.stopPropagation()'>Joe Donnelly</a> (D-IN) talk during a hearing in the Russell Senate Office Building May 13, 2014 in Washington, DC. The committee heard from witnesses about high frequency and automated trading in the futures markets.