Registered nurses from coast to coast are stepping up the challenge to the controversial Keystone XL pipeline with a demand that Secretary of State John Kerry provide proof that Keystone will not harm the health and safety of Americans prior to any final decision on the project. In addition, National Nurses United, the nation’s largest organization of RNs, is circulating an online petition to Kerry that will be presented to the State Department demanding the guarantee, and has released a new short video from nurses titled, “Don’t Pipeline My Patients.â€