It is fair to assume that under such circumstances Walker's emphatic stipulation was deliberately and thoroughly discussed.

Indeed, extraordinary urging had been necessary to induce him to reconsider his early refusals.

Douglas personally joined in the solicitation.
Because of the determined opposition of his own family, Walker had promised his wife that he would not go to Kansas without her consent; and President Buchanan was so anxious on the point that he personally called on Mrs.Walker and persuaded her to waive her objections.[4] Under influences like these Walker finally accepted the appointment, and the President and Cabinet acquiesced in his conditions without reserve.

He wrote his inaugural address in Washington, using the following language: "I repeat then as my clear conviction that unless the convention submit the constitution to the vote of the actual resident settlers, and the election be fairly and justly conducted, the constitution will be and ought to be rejected by Congress." [Sidenote] Douglas, Milwaukee Speech, October 13, 1860.
He submitted this draft of his inaugural to President Buchanan, who read and approved the document and the promise.

Secretary Cass wrote his official instructions in accordance with it.