The National Retail Federation, the nation's largest retail trade group, has been critical of Trump's proposal and said last week that proposed tariffs on six product categories alone -- clothing, toys, furniture, household appliances, footwear and travel goods -- would reduce American consumers' spending power by $46 billion to $78 billion every year the tariffs are in place, according to a study commissioned by the group and prepared by Trade Partnership Worldwide LLC, an economic research firm.