After months of uncertainty around whether Ali Abdullah Saleh has been sincere about stepping down from his post as Yemen’s president, Sunday brought confirmation that he has left the country to seek medical treatment in the United States. Under a deal brokered by the Gulf Cooperation Council with United Nations, United States and United Kingdom assistance, Saleh is barred from partaking in the Feb. 21 elections for an interim president. In exchange, he received immunity in an unamendable law — both nationally and internationally highly controversial — passed by Yemen’s parliament the day before his departure.