beverly hill u.s. treasury secretary steven mnuchin say monday economic growth three percent achievable next two years trump administration set dramatically cut tax speak milken institute global conference beverly hill california almost week help unveil plan cut tax many people corporations 15 percent mnuchin say tax reform regulatory relief help spur economic growth mnuchin comment also come days government data show tepid economic growth 0.7 percent last three months tax plan version job bill mnuchin say onstage interview journalist maria bartoromo although stock market react positively trump election 500 index 11 percent since november critics tax plan say ambitious lack detail light-hearted moment mnuchin quip many conference thank surge bank stock help lift portfolios bring laughter audience fresh detail trump plan uncertain time frame conference express concern generally optimistic atmosphere might begin fade concern see tax healthcare reform end year market start doubt administration ability deliver say scott minerd global chief investment officer guggenheim partner mnuchin say work congressional leaders push tax reform hop bi-partisan support mnuchin tell cnbc sideline conference tax proposal purposely vague administration could work legislators craft something pass congress trump administration invite many business leaders white house listen closely concern hop tax change add david solomon president co-chief operate officer goldman sachs say great sense optimism early trump tenure may fade quarter feel like conviction tax regulatory reform mute solomon predecessor goldman gary cohn join trump administration director national economic council one primary goals work tax reform one concern associate trump tax plan government plan pay mnuchin say plenty ways set revenue would lose reduce tax receipt offer many specifics indeed many conference include investment managers whose businesses could benefit dramatically cut tax cheer new administration can-do attitude also include plan tackle health care reform prospect growth look good around world several say yet also rumble concern ambitious project would complete tensions around world governments would increase mohamed el-erian chief economic adviser allianz say optimism chart accord stock market geopolitical issue real concern refiled add solomon co-chief operate officer title mnuchin see u.s. growth reach percent time tax cut help