BirthRight Citizenship: Why Hasn't Paul Co-sponsored the following?

[Lord Xar]

If he is against birthright citizenship, why hasn't he co-sponsored any of these?

H.R. 698 [109th]: Citizenship Reform Act of 2005
or
H.R. 1567 [108th]: Citizenship Reform Act of 2003

[foofighter20x]

Because those aren't before Congress.

He has his own bill currently before Congress concerning this...

House Joint Resolution 46 (http://thomas.loc.gov/cgi-bin/query/z?c110:H.J.RES.46:)

He probably didn't co-sponsor the ones you ask about because Dr Paul sees only a Constitutional Amendment as the appropriate fix, not more laws than can be easily changed.