There actually has been several proposals for this. I dug them up once for another thread.

H.R. 698 (Deal, R-GA, 9 February 2005) proposes to amend the Immigration and Nationality Act to declare that US-born children whose parents are not US citizens or permanent residents should be considered not to be subject to the jurisdiction of the US, and thus not US citizens under the 14th Amendment. Whether this tactic would survive an inevitable court challenge is, to say the least, uncertain. (Similar measures have been introduced in past Congresses; e.g., H.R. 1567 in the 108th Congress, H.R. 190 in the 107th Congress, and H.R. 319 in the 106th Congress.)

So, some lawmakers are thinking about it, they just haven't been able to get the support.

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