U.K.'s Labour Party to choose successor to leader Jeremy Corbyn on April 4

Britain's opposition Labour Party will elect a new leader after veteran socialist Jeremy Corbyn said he would step down following his party's election defeat last month to Prime Minister Boris Johnson's Conservatives.

The Labour leadership ballot will run from Feb. 21 to April 2, with results announced on Saturday, April 4. The party will also elect a new deputy leader.

The next leader and deputy leader will be chosen by a vote of party members and other affiliated or registered supporters.

• Jan. 7-13: Candidate nominations open from members of Parliament and members of the European parliament.
• Jan. 14-16: People can pay a small fee to become a registered party supporter.
• Jan. 20: Freeze date after which new members and affiliated supporters will not be eligible to vote.
• Feb. 21: Ballot opens. Voters rank eligible candidates.
• April 2: Ballot closes.
• April 4: Special conference to announce the result.

After making gains under Corbyn in the 2017 election, Labour suffered disappointments in last year's European and national elections. Labour's seat total in the House of Commons is now 202, a drop of 60 since the previous election, as the Conservatives romped to a majority government.

Here are the announced and potential leadership candidates:

Clive Lewis

Announcing his plan to run for leader, Lewis, 48, said he believed party members needed to have a greater say over selecting candidates and determining policy.

Before becoming a member of Parliament in 2015, Lewis was a television news reporter for more than 10 years. He was also a member of the army reserve, serving in Afghanistan in 2009.

Lewis was involved in student politics while at university. He is now a junior finance spokesman for Labour, having previously done stints as both the party's spokesman for defence and for business.

Rebecca Long-Bailey

Long-Bailey, 40, has yet to declare her intention to run but is seen as a strong contender because she has strong ties with trade unions, who are hugely influential within Labour, and is close to Corbyn and his senior ally John McDonnell.

She represents the northern English constituency of Salford and Eccles and serves as Corbyn's business spokeswoman. Her first job was working in a pawnbroker's, and she went on to become a solicitor in the health-care sector.

Lisa Nandy

Nandy, a 40-year-old former Labour policy chief for energy and climate change, has said the party will become irrelevant unless it changes course. She is running for the leadership.

A lawmaker who has represented the northern English town of Wigan since 2010, Nandy says Labour should focus more on towns, where she believes "there is a strong feeling … that Labour stopped listening long ago."

She resigned her energy post in 2016, one of several so-called "shadow ministers" who quit in protest against Corbyn. "He is unable to form a broad, inclusive shadow cabinet that draws on the best of our movement's left and right traditions," she wrote at the time.

Jess Phillips

Known for being outspoken and candid, Phillips has long been a Corbyn critic. The 38-year-old ran women's refuges for victims of domestic abuse before becoming member of Parliament for Birmingham Yardley in central England in 2015.

The youngest of four children, Phillips grew up in a Labour-supporting working class household and was given membership of the party for her 14th birthday. It was a childhood ambition to become prime minister.

Phillips said she would run for the leadership to challenge Johnson, and to rebuild trust with voters. Politics needs honest voices, she said.

Keir Starmer

Starmer, 57, has been Labour's Brexit spokesman since October 2016 and is seen as having played a key role in pushing the party to back a second referendum on leaving the EU.

Starmer said he had spent his life fighting injustice, and was now ready to take on Johnson's Conservatives. Seen as a party centrist, Starmer has warned against overreacting to the party's election defeat by ditching Corbyn's left-wing agenda entirely. He describes himself as a socialist.

Starmer is a barrister who served as a senior public prosecutor before entering Parliament. He was knighted in 2014 for services to law and criminal justice.

Emily Thornberry

Thornberry, 59, has represented the seat in north London next door to Corbyn's since 2005 and is Labour's foreign affairs spokeswoman. She says she plans to run for the leadership.

A strong supporter of a second Brexit referendum and of remaining in the European Union, Thornberry has said the question for the next leader should not be their position on Brexit but what their plan is for taking on Johnson.

Thornberry joined Labour when she was 17, saying she was motivated by her experience of being raised by a single mother in social housing. She went on to become a human rights lawyer.