Labour leader, Jeremy Corbyn, arrives to launch his leadership campaign at a press conference on July 21, 2016 in London | Carl Court/Getty Images Jeremy Corbyn threatens MPs with open selection process Labour leader says it will apply throughout the UK when electoral boundaries are redrawn in 2018.

At the launch of his re-election campaign Thursday, Labour leader Jeremy Corbyn warned his party's MPs they faced an open selection process.

It will be in effect throughout the U.K. when electoral boundaries are redrawn in 2018.

"There would be a full selection process in every constituency but the sitting MP ... would have an opportunity to put their name forward," Corbyn said. "So there will be a full and open selection process for every constituency Labour Party through the whole of the UK."

Corbyn also said the National Executive Committee was in charge of candidate selection decisions, and sitting MPs would be "automatically included in the short list for selection."

After Corbyn's speech, Mike Gapes, Labour MP for Ilford South, tweeted: "Bring it on. Then see what happens."

Bring it on. Then see what happens. https://t.co/9TKLpNP5X2 — Mike Gapes (@MikeGapes) July 21, 2016

A survey last month found that the majority of Labour members who have joined since May 2015 favored the de-selection of MPs who persistently criticize the party's leadership.