Santorum birtherism is not welcome on FR. His father served in the military in WWII, aptly demonstrating his loyalty. There is also a document on the internet that shows Italy revoked Aldo Santorum’s citizenship back in the 1930s.
There doesn't appear to be a law, prior to Rick Santorum being born, that automatically made aliens serving/served in the military (WWII or other) U.S. citizens. Santorumm's father, therefore, would have had to initiate and go through the naturalization process himself.
The McCarran-Walter Act, 1952, made aliens who served for 5 years eligible to be perminant lawful residents:
Act June 30, 1950, ch. 443, § 4,64 Stat. 316, as amended June 27, 1952, ch. 477, title IV, § 402(e),66 Stat. 276, provided that: Notwithstanding the dates or periods of service specified and designated in section 329 of the Immigration and Nationality Act [this section], the provisions of that section are applicable to aliens enlisted or reenlisted pursuant to the provisions of this Act and who have completed five or more years of military service, if honorably discharged therefrom. Any alien enlisted or reenlisted pursuant to the provisions of this Act who subsequently enters the United States, American Samoa, Swains Island, or the Canal Zone, pursuant to military orders shall, if otherwise qualified for citizenship, and after completion of five or more years of military service, if honorably discharged therefrom, be deemed to have been lawfully admitted to the United States for permanent residence within the meaning of such section 329(a) [subsection (a) of this section].
http://www.law.cornell.edu/uscode/text/8/1440
Furthermore, if in fact Aldo's citizenship was revoked by Italy back in the 1930's, that would essentially make his father "stateless" until his father went through the naturalization process on his own.
The naturalization papers (proof) of Aldo Santorum is what people are demanding.
The citizens of this country deserve to know if a candidate (any candidate, including Republicans) is eligible for the public elected office they seek.