Qatar’s ruling emir on Tuesday lashed out at criticism of his country over its hosting of the 2022 FIFA World Cup, describing it as an “unprecedented campaign” targeting the first Arab nation to hold the tournament. Since winning hosting rights for the World Cup over a decade ago, Qatar has faced scrutiny and criticism for its treatment of migrant workers and the gay community, among other issues. The alleged abuses affecting legions of low-paid laborers who power Qatar’s economy and who built its gleaming World Cup stadiums have been a lighting rod for protest around the world, especially in Europe.