The DUP's Sammy Wilson was one of just two non-Tory MPs to vote for the UK government's controversial new legislation to restrict strikes.
The bill would require "minimum service levels" during public sector strikes, but trade unions have condemned the plan as "undemocratic, unworkable and illegal".
It cleared its first hurdle in Parliament this week with 309 MPs to 249, a majority of 60, voting to give the bill a second reading.
