A U.S. nurse who challenged quarantines of health care workers returning from treating West African Ebola patients said on Sunday she thought "an abundance of politics" lurked behind them. Kaci Hickox has fought a heated public battle over what she considers draconian measures to isolate her for 21 days after her return from Sierra Leone, in a case that highlights the dilemma over how to balance public health needs and personal liberty. In some U.S. states officials such as New Jersey Governor Chris Christie have imposed strict quarantines on health workers returning from three Ebola-ravaged West African countries, but the U.S. federal government opposes such measures.