washington democrats u.s. house representatives ramp efforts force release president donald trump tax return call critical issue transparency national security house democrats say would use parliamentary procedure file petition aim force vote legislation require u.s. presidents disclose multiple years federal income tax file representatives white house house speaker paul ryan immediately respond request comment trump republican new york real estate developer tout business acumen 2016 presidential campaign defy decades precedent candidates refuse release tax return say audit internal revenue service say audit pose obstacle release tax return democrats so-called discharge petition move forward would need obtain signatures support majority 435 lawmakers republican-controlled house move could long-shot give two republicans representatives mark sanford justin amash sign sponsor propose bill would see vote petition late effort democrats issue two glimpse trump tax surface media report 1995 2005 file democrats say trump tax national security issue give congressional investigations possible tie russia campaign also cite concern potential conflict interest privately hold global businesses know make policy decisions know trade deal ... foreign countries look american people line pocket democratic representative bill pascrell say reporters house democrats press trump release tax return