washington president barack obama want boost u.s. aid colombia help remove landmines implement government peace accord leftist rebel group white house say tuesday obama would discuss plan colombian president juan manual santos white house visit thursday invite u.s. lawmakers participate two events aim show support potential deal would end latin america long war fight colombian government revolutionary arm force colombia farc kill 220,000 people displace millions since begin 1964. three previous attempt peace accord fail almost four years talk elusive peace deal may finally sight say bernard aronson u.s. envoy negotiations think real prospect success sign peace accord year hopefully within first half year aronson tell reporters conference call deal farc rebel would disarm government would need expand health education service areas country control group two areas expand u.s. financial aid could help say mark feierstein senior director white house national security council one big challenge demobilize farc ensure reintegration society constructive members feierstein say feierstein decline comment much additional aid obama would propose unite state long donor colombia provide almost 10 billion aid 2000 2015 program call plan colombia accord congressional research service colombia government tuesday warn country second-largest rebel group national liberation army eln time run begin peace negotiations end five decades war eln talk would independent farc thursday santos meet vice president joe biden group u.s. senators biden residence talk peace process future u.s. support colombia late meet obama oval office obama santos also expect discuss ways two countries work together fight zika virus feierstein say obama offer colombia 's santos u.s. aid help peace deal