president donald trump say tuesday will shut government get fund u.s.-mexico border wall complicate two must-pass measure congress take september spend package raise debt ceiling need know potential shutdown u.s. government congress must pass annual spend bill around end federal fiscal year sept. 30 fund much u.s. government disagreements prevent frequent lawmakers often pass temporary bill extend exist spend level change days weeks months work longer-lasting deal agree either new spend plan short-term extension government shut happen many time since 1970s usually days rattle market congress return long summer recess sept. 5. time 12 work days approve spend measure keep government open spend measure pass oct. portion government begin shut non-essential employees go without pay agreement reach government recently shut two weeks october 2013 fund former president barack obama healthcare law three shutdowns 1990s long last 21 days 1970s 1980s 14 shutdowns partial last days debt ceiling legislative limit much money federal government borrow debt issue u.s. treasury limit reach congress must raise government continue borrow money would default unable pay bill treasury say want congress increase debt ceiling sept. 29 although default likely could stave mid-october thank extraordinary measure treasury put place march delay debt reckon legislation raise debt limit need adopt late early mid-october debt ceiling raise government would able borrow money pay bill include payments debts could hurt u.s. credit rat political gridlock never lead unite state reach debt ceiling bill go unpaid close call august 2011 standoff cost country top-notch bond rat credit rat agency standard poor cause jar two weeks financial market since 2007-2009 global financial crisis two move separate track likely get tangle together republican opponents debt ceiling increase likely demand federal spend cut analysts say congress may try tackle issue time spend debt ceiling bill pass republican-led house representatives simple majority vote need 60 vote pass senate republicans hold 52 100 seat mean need democratic support trump make u.s.-mexico border wall central promise 2016 presidential campaign also promise mexico would pay wall mexico steadfastly refuse trump largely stop talk pledge conservative house republicans agree republican president need wall say border-wall fund priority spend legislation already indicate will shut government get moderate republicans call shutdown unwise republican leaders determine prevent one fear would worsen doubt party ability govern democrats uniformly oppose trump wall say responsibility shutdown would rest solely republicans trump administration reverse course early month say would back clean raise debt ceiling mean would tie policy measure democrats moderate republicans also support clean debt-ceiling increase conservative republicans especially house often use debt-ceiling legislation insist change spend make oppose clean bill factbox trump 's government shutdown threat loom debt ceiling