Farage’s Reform UK is soaring in the polls—and doing better at the ballot box—as voters lose patience with slow economic growth and high immigration.

The candidate for Reform U.K., the right-wing party of British lawmaker and ally of President Donald Trump, Nigel Farage, won a parliamentary by-election by six votes, taking the seat from the governing Labour Party in a stunning political upset.

Local elections in England this week are a key test for Nigel Farage. The hard-right politician who helped drag Britain out of the European Union wants to displace the Conservatives as country’s main party on the right,