The House of Lords Constitution Committee said in a report that the legislation to end Britain’s European Union membership has “fundamental flaws”, including ministerial powers it considers too sweeping. The legislation is likely to be given a rough ride by the largely pro-EU lawmakers in the upper house and comes as Prime Minister May battles rebellion within her own party over the best route out of the bloc. The Lords committee expressed concern that the government will use the Brexit process to reshape EU laws without proper parliamentary scrutiny as they move into British law. The committee also urged the government to reach agreement about which powers currently held in Brussels will return to Britain’s central government and which will be devolved to Scotland, Wales and Northern Ireland. The legislation was cleared by the House of Commons this month and will begin its journey through the House of Lords on January 30. It is expected to take until the summer for it to become law.