The Antiquities Act is pretty specific. It has shared a line that declares the size to be as small as possible to protect the endangered area.
Originally based due to the immediate need to protect tribal artifacts from thieves. Something to be shaped quicker than the typical debates that rightfully occur with those we vote to represent our interests. This was the intent behind T.R. and Congress when originally sold to our Representatives.
They, those we vote as our voice of the majority, did not establish this act to design a means to ignore our democratic due process.
While you and others may value last minute National Monument designations such as Obama's December 28th, 2016 decision for 1.4 MILLION acres... Bears Ears, others, such as myself find this an abuse of T.R and Congress intent for the creation of the Act.
I care not for partisan b.s. I care about one person side stepping our American Republic.
Obama, as an example, abused the authority our Representatives granted him with the Antiquities Act. He was well aware the Democrats failed to represent their base and gave away their stake w/in the Legislative Branch. He, from many people's perspective, including mine, feared those whom we voted to represent us would not see it from his view, the minority representation and failed to adhere to keeping it as small as necessary to protect the endangered historical and scientific interests the tribal identified 13 areas provide.