No, a president has very little to do with abolishing constitutional rights, even if she wanted to. The original Second Amendment guaranteed the right of well-regulated state militias -- essentially, all free men -- to train and be prepared to defend freedom against a potential overweening federal government. But after the Civil War -- given that southern states had used those militias instead to oppress people (blacks) and suppress freedoms (whereas the federal government had freed people) -- the Second Amendment was reinterpreted (by the Fourteenth Amendment and other Reconstruction acts) to include the right of individuals to protect themselves, so that (for instance) freed blacks could defend themselves against the rising Ku Klux Klan. And that's where we stand today. Regulations are constitutional, and the right to defend oneself is constitutional. For more on this -- and on what it would take to change it -- read the wonderful constitutional scholar Akhil Reed Amar.