washington president donald trump try rally republican lawmakers behind plan dismantle obamacare tuesday u.s. stock market show bad one-day performance since november election trump try win first major legislative battle presidency pressure grow businessman-turned politician deliver investors become worry fail healthcare push could also portend trouble promise tax cut relax regulation propel market record highs recent months one visit make u.s. capitol since take office two months ago trump tell fellow republicans house representatives tuesday morning would face political problems oppose bill take apart obamacare partially replace late day trump host roughly dozen lawmakers oval office listen concern president really clear lay line everybody house speaker paul ryan lead proponent bill tell reporters make promise time keep promise ... keep promise hard manage this 500 dow jones industrial average lose percent bad one-day performances since trump election victory nov. financial index sink 2.87 percent big daily fall since june back forth congress new healthcare plan belief healthcare plan pass move tax feel things get do maybe market anticipate get hold say mark kepner manage director themis trade chatham new jersey conservative lawmakers believe healthcare bill go far enough moderate republicans worry millions americans hurt dismantle 2010 affordable care act democratic former president barack obama 's signature healthcare legislation graphic u.s. healthcare stack aca ahca click tmsnrt.rs/2n0zmkf party leaders hope move bill house floor debate early thursday administration house leadership afford lose 20 republican vote risk bill fail since democrats unite republican representative mark meadows chairman conservative house freedom caucus say roughly three dozen members decide vote bloc many 21 currently plan vote legislation accord cnn report republican representative walter jones say trump tell lawmakers closed-door meet capitol republican bill pass would face political problems jones say think trump mean lawmakers could lose seat repeal replace obamacare one trump main campaign promise goal republicans since enact trump predict republicans could face challenge primary contest ahead 2018 midterm elections gut obamacare also danger republican bill pass millions voters might lose healthcare coverage congressional budget office say last week 14 million people would forfeit coverage house bill next year although number could change base current version legislation nancy nielsen associate dean health policy university buffalo jacobs school medicine say republican leaders tough spot not-so-delicate balance act win conservative house senate members without cause outrageous backlash voters next election nielsen say democrats oppose republicans plan say would hurt elderly poor work families give tax cut wealthy republican leaders tweak bill week try satisfy critics mainly party republican chairmen two key committees say late monday propose fund tax credit conservatives oppose would give senate flexibility help old people afford health insurance additionally obamacare tax would eliminate 2017 instead 2018. amendments also address medicaid country large health insurance program cover 70 million people mostly poor change would allow state implement work requirements certain adults idea champion many conservatives decide receive federal fund congressman dan donovan attend oval office meet tuesday say trump listen direct political talk threats say donovan announce whether support bill cite people lose medicaid defunding women healthcare provider plan parenthood concern new york district club growth influential conservative lobby group say would spend least 500,000 ads television digital platforms urge congress members defeat bill senate also vote legislation change could make senate majority leader mitch mcconnell say house approve healthcare bill would try bring senate floor next week trump try rally support healthcare bill