(CNN) Veterans Affairs Secretary Robert Wilkie did not disclose his associations with Confederate groups on a questionnaire submitted to the Senate Veterans' Affairs Committee prior to his confirmation hearing last year, according to a copy of the form obtained by CNN's KFile.

Wilkie was required to disclose in a sworn statement submitted to the Senate committee his public statements, published materials and memberships he held in organizations over the past decade. Wilkie, however, did not disclose any of his ties to Confederate groups. Wilkie signed the questionnaire affirming that the information provided is "to the best of his/her knowledge and belief, current, accurate, and complete."

Curt Cashour, a spokesperson for Wilkie, did not answer questions as to why the secretary did not list the associations on the questionnaire. Instead, Cashour provided the same statement he had provided for a story published in December.

"Whether the handful of events took place close to a decade ago or 15-20 years ago, Secretary Wilkie gave his best recollection of his participation in them, and emphasized that they were strictly historical in nature, almost all official and bipartisan, and he stopped participating in them once the issue became divisive. He was not aware that the remarks had been published, and, as he stated, he did not keep copies of the remarks," Cashour said.

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