But Government lawyers are arguing that if Ms Miller and her supporters' legal challenge succeeds, the Government "could not give effect to the will and decision of the people, as clearly expressed in the referendum, to withdraw from the EU without further primary legislation".
Hooray, a change.org petition rides to the rescue!
There's also a court case going on, about whether there should be a Parliamentary vote:
https://www.theguardian.com/politics/2016/oct/13/government-cannot-trigger-brexit-without-mps-backing-court-told-article-50
http://www.standard.co.uk/news/politics/brexit-london-businesswoman-leading-legal-challenge-against-theresa-may-sent-death-threats-and-a3368756.html
The Government's case seems hopelessly weak:
Clearly scared MPs will get uppity.