The Commission only asked for the publicly available information. Turning over all of the publicly available information is, in fact, cooperating fully, no matter how much people try to say it's only cooperating partially. In the letter, after listing all of the possible types of information the states might send, Kobach clearly states "if publicly available under the laws of your state" 

Rather than depending on biased and unreliable media, or politicians with ulterior motives, to tell you about a letter, 
why not read the actual letter? 

Here: http://media.kansascity.com/livegraphics/2017/pdf/PEICletter.pdf 

Again, turning over all the publicly available information is in fact cooperating fully. 

36 states have committed to cooperating fully.