A group of British opposition Labour lawmakers will on Monday announce they are leaving the party over leader Jeremy Corbyn’s approach to Brexit and a row over anti-Semitism, a source said, adding more resignations could follow.

The small group, possibly about five lawmakers, will make the announcement today at 10:00 GMT., after weeks of growing calls for Corbyn to change strategy and start campaigning for a second referendum.

The Labour source, close to the group, said Monday’s departures could trigger a second wave of resignations, underlining the frustration over Corbyn’s approach.