london prime minister theresa may blueprint britain exit european union face crucial test start tuesday lawmakers try win concessions weaken leader government legislation sever tie yet another battle may scandals gaffes bring question leadership open many 40 lawmakers would support no-confidence motion accord sunday time newspaper many source govern conservative party say time force despite back britain remain eu even reluctantly think still best option deliver brexit make debate eu withdrawal bill important test ability steer legislation say crucial give company confidence rule change britain leave march 2019. power balance favor lawmakers rather government conservatives lose majority june election many even within party use debate come weeks put pressure intention parliament bystander key participant process say hilary benn lawmaker opposition labour party chair brexit parliamentary committee end go vote final deal outcome election balance vote house commons really bring home tell institute government thinktank early month public debate parliament tuesday first eight discuss bill go legislative stag schedule determine house commons course debate lawmakers propose 186 page amendments bill largely copy paste eu rule regulations british law also critics say hand government wide-ranging power cut parliament brexit plan bill separate negotiations go brussels eu want see many amendments pass regard showdown test may strength home may pressure make progress eu summit december grow european frustration britain refusal say much think pay leave amendments include one stop government adopt so-called henry viii power name 16th century monarch rule proclamation allow government amend laws transpose eu law amendments address criticism parliament get meaningful vote deal eventually agree eu press government enshrine law eu protections britons enjoy workers right environmental protections may government take fire propose challenge signal will bend henry viii power monday brexit minister david davis say parliament would offer new vote final brexit deal first debate cover part bill repeal 1972 european communities act retention conversion interpretation exist eu laws eu right get parliamentary scrutiny winner government change position want defeat say one conservative lawmaker speak condition anonymity issue push vote parliament eu deal could force government back negotiate table even possibly overturn brexit present huge challenge debate come new low point may since make prime minister britain vote brexit last june lose two minister week foreign minister boris johnson pressure opposition resign comment jail aid worker iran case complicate weekend gove ally monday keir starmer brexit spokesman labour party launch new bid derail withdrawal legislation say may policy end jurisdiction eu court european court justice incompatible policy smooth transition brexit recent weeks become increasingly clear alone authority deliver transitional deal europe take necessary step protect job economy write open letter may weak ever may face test uk parliament brexit plan