washington federal appeal court monday bring end president barack obama bid overturn rule threaten gut signature healthcare law put case hold president-elect donald trump aim repeal obamacare take office obama administration appeal judge may rule favor challenge file republicans u.s. house representatives key part 2010 law u.s. court appeal district columbia circuit agree request republicans delay consideration government appeal trump take office jan. 20. obama administration oppose move law repeal congress case would moot court decision put case hold immediate effect law low court rule put hold pending appeal court say side provide update status case feb. 21. challenge target government reimbursements insurance company compensate reductions law require make customers out-of-pocket medical payments trump say favor repeal replace obamacare would consider retain certain elements law enable millions previously uninsured americans obtain health insurance republicans condemn obamacare government overreach mount series legal challenge obama administration appeal u.s. district judge rosemary collyer rule government spend billions dollars federal fund without congressional approval provide subsidies healthcare law private insurers help people afford medical coverage house republicans argue administration violate u.s. constitution legislative branch executive branch authorize government spend obama administration interpret provision type federal spend need explicitly authorize congress u.s. supreme court 2012 2015 issue major rule author conservative chief justice john roberts preserve obamacare reject conservative challenge u.s. court put obamacare case hold trump take office