(CNN) -- Kaci Hickox, a nurse placed under mandatory quarantine in New Jersey, went on CNN on Sunday and criticized the "knee-jerk reaction by politicians" to Ebola, saying "to quarantine someone without a better plan in place, without more forethought, is just preposterous." Hickox, an epidemiologist who was working to help treat Ebola patients in Sierra Leone, has tested negative twice for Ebola and does not have symptoms, she said.