washington top aide u.s. president donald trump sunday defend colleague kellyanne conway widely criticize public endorsement fashion line trump daughter ivanka speak abc week program white house aide stephen miller say trump adviser conway make light-hearted flippant comment urge americans buy ivanka trump products conway comment prompt criticism republican democratic lawmakers well legal experts say may violate ethics rule prohibit use public office endorse products advance personal business gain comment associate press last week republican jason chaffetz chairman house representatives oversight committee say conway statement clearly line unacceptable elijah cummings top democrat committee say sunday miller characterization conway remark incorrect textbook case violation law say week cummings say trouble fact trump authority ultimately decide punish conway office government ethics issue recommendation matter conway make comment retailer nordstrom say would stop sell ivanka trump clothe line move prompt tweet president blast nordstrom nordstrom say make decision drop brand sales steadily decline especially last half 2016 carry line make good business sense nordstrom share initially fell president criticism last wednesday close percent new york stock exchange day saturday spokesman major u.s. retailers sear kmart say remove 31 trump home items online product offer order focus profitable merchandise trump aide say endorsement ivanka 's brand 'light-hearted