washington u.s. treasury secretary steven mnuchin tell lawmakers thursday doubt know alternate score model give enough credit potential economic growth assess impact trump administration tax plan late april administration put one-page overview tax reform plan would cut tax businesses 15 percent well cut tax simplify income tax bracket individuals critics question tax cut would offset without drive federal deficit say repeatedly plan put forward believe pay economic growth mnuchin tell senate bank committee concern whether model attribute enough growth dynamic score present detail present think pay for mnuchin say april plan deliberately vague order allow white house effectively work lawmakers come joint agreement could pass congress pay tax cut remain stick point fiscal conservatives republican-controlled congress would strongly prefer revenue-neutral plan increase deficits mnuchin say cut would pay dynamic score model analysis take account effect tax change economic growth revenue thursday hear mnuchin also pepper democrats committee detail tax plan include whether cut would mostly benefit wealthy assure president objective objective create middle income tax cut raise tax middle income anything opposite mnuchin say add plan would get rid almost every single tax deduction say disproportionately use wealthy aim 95 percent americans would long need itemize deductions late thursday u.s. chamber commerce event treasury secretary insist tax reform remain track despite grow doubt among investors size scope cut achievable congress renew push repeal obamacare currently work senate report president donald trump may try interfere federal investigation shift focus away congressional agenda still hopeful get tax reform do year mnuchin say treasury 's mnuchin concern alternate score model trump tax plan