washington americans begin sign obamacare health insurance plan wednesday experts expect reduce participation bitter political debate cloud program future republicans congress repeatedly fail repeal replace former president barack obama healthcare law say drive cost consumers interfere personal medical decisions democrats warn repeal would leave millions americans without health coverage president donald trump promise kill obama affordable care act 2016 election campaign take step undermine law declare dead implode trump administration cut obamacare advertise 90 percent shorten enrollment period half market go extremely confuse go entire complexity choice say david anderson health policy researcher duke university obama take social media wednesday encourage americans need insurance sign federal healthcare.gov website stress government tax credit would keep coverage affordable obama ask people get word country work best look one another new trump ad pay republican national committee blame democrats obamacare skyrocket insurance premiums block efforts repeal law obamacare advocate warn sign-ups individual insurance coverage law could drop one million people 2018 compare 2017. nonpartisan congressional budget office estimate four million few people sign obamacare private insurance previously forecast due trump policies still cbo expect total enrollment reach 11 million 2018 around 10 million obtain pay coverage 2017. administration officials could immediately say 2018 enrollment data would make public trump administration cut 2018 enrollment period half six weeks nov. dec. 15 state use federal healthcare.gov website enrollment previously run jan. 31 many consumers tend sign last two weeks accord state officials organizations help people choose insurance administration also cut billions dollars subsidies insurers use discount out-of-pocket medical cost low-income americans cut fund group help people enroll health insurance several insurers exit obamacare market due concern subsidies trump action remain raise monthly premium price account lose government subsidies senate republicans democrats work legislation stabilize obamacare market short term include restore subsidies trump seek far-reaching change urge republicans take full-scale repeal come months department health human service say monday premiums popular obamacare plan would rise 37 percent 2018. americans eligible obamacare tax credit buy insurance may pay less coverage middle-class consumers get subsidies face much high price plan flood information lot population think affordable care act already put say daniel polsky professor university pennsylvania executive director leonard davis institute health economics strange premium increase go confuse consumers trump administration plan change 2019. last week propose rule give state flexibility benefit must cover insurance obamacare insurers cover set 10 benefit maternity newborn care prescription drug obamacare 2018 enrollment cloud uncertainty trump