British Prime Minister Theresa May has approached a number of members of parliament from the opposition Labour Party to put forward an amendment to her withdrawal motion, The Sun newspaper reported late Thursday.

May is planning to back a new package of workers’ rights in a deal with some members of the Labour Party, the report said, citing sources.

On Wednesday, Labour made public a letter written by opposition leader Jeremy Corbyn to May offering to support her Brexit deal if she makes five legally binding commitments, including joining a customs union.

Britain is scheduled to leave the European Union March 29.