Activists and members of the opposition Labour Party in Britain have criticized their leader Jeremy Corbyn after suggesting he would press ahead with Brexit if the party won a snap general election.

The Guardian newspaper said in a report on Sunday that Corbyn was facing a backlash from Remain supporters in Labour, who accused him of betraying the party membership by appearing reluctant to back a second referendum over whether Britain should exit the European Union.

Chair of a main youth and student-led organization in the Labour said Corbyn faced a real risk of losing the backing of many young members who propelled him to party leadership and nearly helped him win snap elections last year.

“Students and young people will not forget or forgive politicians who sell them down the river by backing a Brexit that limits our life opportunities and makes us poorer,” said Richard Brooks, who heads the pro-EU For our Future’s Sake.

“Jeremy Corbyn is in danger of betraying and losing the support of millions of young people and students who very nearly propelled him to Downing Street last year, and whose support he needs if he is to ever to become prime minister,” said the Labour activist and member.

Corbyn said in an interview to the Guardian on Saturday that he would not seek to abolish the results of an original Brexit referendum in June 2016 in which Britons narrowly voted to leave the EU after more than 40 years.

He said if Labour wins a potential election in 2019, which would be meant to end the political uncertainty over Brexit, the party would mostly seek to renegotiate a deal signed with the EU by the current conservative-led government.

Many to the left of the Labour have called for a second referendum on Brexit which could allow Britain to stay in the EU.

The government has said such a vote would be highly divisive and Britain has to leave the bloc in March regardless of what happens to its Brexit deal in parliament in January.