Which preposition to use with rebuttal

as Occurrences 1%

It was arranged that Inspector Chippenfield should be called to give evidence in rebuttal as to the impossibility of seeing the library window through the tree, and that an arboriculturist should also be called.

of Occurrences 1%

Those workingmen were without doubt waiting for the rebuttal of his answer from their venerable spokesman.

Which preposition to use with  rebuttal