British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)

British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)

British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)

British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)

British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)

British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)

Photo taken on Sept. 21, 2019 shows a general view of the Labour Party Annual Conference 2019 in Brighton, Britain. (Xinhua/Han Yan)

British Labour Party leader Jeremy Corbyn listens as he attends the Labour Party Annual Conference 2019 in Brighton, Britain on Sept. 21, 2019. (Xinhua/Han Yan)