A controversy arose in March 2016 following public remarks by ULA VP of Engineering, Brett Tobey, whose comments were, according to Peter de Selding of SpaceNews, "resentful of SpaceX" and dismissive of one of the two competitors (Aerojet Rocketdyne) for the new engine that will power the Vulcan launch vehicle, which was under development. Tobey resigned on 16 March 2016 and Bruno disavowed the remarks. Senator John McCain asked the DoD to investigate the comments that implied it may have shown "favoritism to a major defense contractor or that efforts have been made to silence members of Congress". The Secretary of Defense asked the DoD's Inspector General to investigate.