Coming so late in the Hoover presidency, GCNM2 designation might look like a last-minute grand gesture. However, NPS and others had been working on Toroweap and GCNP extension west for five years. So although it might have come as a surprise to those not involved in the planning, it seems in retrospect a well-considered NPS project. That it was coincident with a paradigm shift in American politics and government certainly added uncertainty. President Roosevelt's Secretary of the Interior, Harold Ickes, was a new, and would become a monumental, force himself, but the complainants about the Monument came from the usual sources.
A week after the proclamation, Dec 30, 1932, NPS sent letters announcing it to Arizona Senators Hayden and Ashurst, "sure they will be interested", and only mentioning Toroweap and auto access to it. Given the thousands of acres of Kanab Plateau taken in, this was disingenuous at best. However, Hayden had already been awakened. On the day before, he had sent NPS a letter from WAKent who, a couple of days before the draft went to the President, wrote Hayden on behalf of the people of Tuweep, saying it was a very fertile valley with prospects of a town, and should be open to homesteading. It was an injustice for NPS to set aside such a vast public entry so useless for park purposes. The withdrawal should be lifted, to a line down to two miles from the Grand Canyon. Kent had already indicated he thought park values were worthy ones. So what I think he was writing about was the 1930 withdrawal, and just happened to coincide with the proclamation, which anyway did not meet his criterion of being within two miles of the Canyon.
The National Parks Association wrote with congratulations, and an NPS press release celebrated the view, the huge cinder cone, and the area's remoteness [perhaps not what the pioneers of Tuweep wanted to cheer about] -- and was off on the acreage by 8% or so.