Portman said he finds it hard to believe that a couple of "rogue agents" in Cincinnati were responsible for the conservative targeting and that it was done as an efficiency measure to handle a large number of applications, as was initially suggested.
These once-novel methods of chip design have done respectably in specialist applications, but have not dethroned Intel as it was suggested they might when they were launched.
In a letter to the Information Commissioner, Mr Gove suggested that there had been "personal attacks" on individuals involved in submitting applications under the controversial scheme.