As others have pointed out, if you are registered to vote, you've already proven you're a citizen. Once is enough. Voter fraud is an imaginary problem dreamed up by the Orange One to encourage voter suppression measures. I'm all for protecting the integrity of our elections, however. So let's start with preventing foreign agents from hacking in to our voter rolls and spreading false, inflamatory political propganda via fake social media accounts. Those acts are proven dangers to our democracy and there is solid evidence it may happen again because the GOP has done nothing to stop it. It's very convenient to blame Facebook for everything and wash their hands of it. Here's a bit of news for the GOP: Vladimir Putin is not a citizen. Foreign powers should have no influence on our elections.