washington president barack obama propose rule stop u.s. company reincorporating abroad paper avoid u.s. income tax appear overstep legal authority top republican lawmaker say friday representative kevin brady say staff scrutinize rule unveil last week u.s. treasury department legal experts offer mix view viability court challenge new rule intend discourage tax inversions lead collapse u.s. drugmaker pfizer inc 160 billion acquisition ireland allergan plc recognize broad discretion areas tax code brady texas republican chairman tax-writing house representatives ways mean committee say speech u.s. chamber commerce certainly appear treasury overstep authority especially effect take legislative proposals pass congress congress essentially make law regulation brady give indication committee might unclear action republican-controlled congress would take inversion rule election year mark voter anger tax international trade share concern inversions everyone right way wrong way tackle brady say inversion tax-driven deal u.s. company acquire small foreign business adopt tax domicile reduce combine company overall tax burden deal often involve reincorporating ireland britain though inversions go since 1980s new wave way five years pfizer-allergan deal would big inversion time bipartisan agreement need comprehensive tax reform address inversions deeply divide congress unlikely tackle 2017 especially elections come november analysts say interim obama administration tighten inversion rule limit areas draw republican criticism administration strategy solve fundamental problem likely make bad brady say obama tax inversion rule may overstep authority u.s. lawmaker