 In May 2011, following an appearance on "Meet the Press", Gingrich was criticized by some conservatives for using the phrase "right-wing social engineering" in apparent reference to Rep. Paul Ryan's voucher system plan for Medicare.In later statements, Gingrich said he was speaking to a general principle that major reforms require the support of the American people, and offered support for Ryan's efforts to promote reform.Gingrich describes himself as a "Teddy Roosevelt Republican" and has professed a deep interest in conservation and maintaining biological diversity.