On 3 September 2019, the British Conservative Party withdrew the whip from 21 of its MPs who had supported an emergency motion to allow the House of Commons to undertake proceedings on the European Union (Withdrawal) (No. 6) Bill on 4 September.^[1] In the hours after the vote, the Chief Whip Mark Spencer informed the rebel MPs that they were no longer entitled to sit as Conservatives.^[2][3] This led to the loss of the Conservative/DUP majority in the Commons.

The suspended MPs included two former Chancellors of the Exchequer (Philip Hammond and the Father of the House, Kenneth Clarke), seven other former Cabinet members (Greg Clark, David Gauke, Justine Greening, Dominic Grieve, Oliver Letwin, Caroline Nokes and Rory Stewart), and 12 others including Nicholas Soames, grandson of Winston Churchill.^[4][5]

On 29 October 2019, 10 of the suspended MPs had the whip restored;^[6] of these, six stood down at the December 2019 election, while four contested it as Conservative candidates, all retaining their seats. Of the 11 who remained suspended, six declined to stand at the election, while five stood as independents or Liberal Democrats; all five lost their seats.

The suspension of these MPs bore resemblance to the Maastricht Rebels who had the Conservative whip removed by the governing Conservative Party during the ratification of the Maastricht Treaty in the early 1990s.

In April 2019, Speaker of the House of Commons John Bercow allowed Sir Oliver Letwin to table a motion that would allow MPs to undertake proceedings on the second reading, committee, and third reading of the European Union (Withdrawal) (No. 5) Bill (also known as the Cooper–Letwin Bill) in one day. The motion was passed by one vote.^[7][8] Subsequently, the bill was passed as the European Union (Withdrawal) Act 2019.

Several of the MPs had voted for Theresa May's ultimately unsuccessful Withdrawal Agreement, and subsequently continued to oppose a "no deal" Brexit scenario. They became known in the media as the "Gaukeward Squad" after their informal leader David Gauke.^[9][10]

In September 2019, Bercow again permitted Letwin to introduce a motion under Standing Order No. 24 (SO No. 24) to take control of parliamentary business away from the government, this time to allow for the passage of the European Union (Withdrawal) (No. 6) Bill, to be introduced by Hilary Benn on the following day.^[11] In anticipation of the vote, the government whips' office announced that voting in favour of Letwin's motion would effectively be "destroying the government's negotiating position and handing control of parliament to Jeremy Corbyn." On that basis, those Conservative MPs supporting the motion would have the whip withdrawn.^[12]

A total of 21 Conservative MPs voted for the motion:

More information Portrait, MP ...

Portrait	MP	Constituency	Parliamentary party status		2019 general election
	Guto Bebb	Aberconwy			did not stand[13]
	Richard Benyon	Newbury		whip restored on 29 October 2019	did not stand;[14] made a peer in the 2020 Special Honours as Baron Benyon.[15]
	Steve Brine	Winchester		whip restored on 29 October 2019	stood as a Conservative;[16] retained seat with a much reduced majority of 985 over the Liberal Democrats.
	Alistair Burt	North East Bedfordshire		whip restored on 29 October 2019	did not stand[17]
	Greg Clark	Tunbridge Wells		whip restored on 29 October 2019	stood as a Conservative;[18] retained seat
	Kenneth Clarke	Rushcliffe			did not stand;[19] made a peer in the 2019 Dissolution Honours as Baron Clarke of Nottingham.[20]
	David Gauke	South West Hertfordshire			stood as an independent; lost seat to Conservatives, coming second.
	Justine Greening	Putney			did not stand;[21] seat gained by Labour, their only gain from the Conservatives at the election.
	Dominic Grieve	Beaconsfield			stood as an independent;[22] lost seat to Conservatives, coming second.
	Sam Gyimah	East Surrey		joined Liberal Democrats on 14 September 2019	stood as a Liberal Democrat in Kensington;[23] lost seat to Conservatives, coming third behind Labour.
	Philip Hammond	Runnymede and Weybridge			did not stand;[24] made a peer in the 2019 Dissolution Honours as Baron Hammond of Runnymede.[25]
	Stephen Hammond	Wimbledon		whip restored on 29 October 2019	stood as a Conservative;[26] retained seat with a much reduced majority of 628 over the Liberal Democrats.
	Richard Harrington	Watford		whip restored on 29 October 2019	did not stand;[27] later made a peer in the 2022 Special Honours as Lord Harrington of Watford.[28]
	Margot James	Stourbridge		whip restored on 29 October 2019	did not stand[29]
	Sir Oliver Letwin	West Dorset			did not stand[30]
	Anne Milton	Guildford			stood as an independent;[31] lost seat to Conservatives, coming fourth behind the Liberal Democrat and Labour candidates.
	Caroline Nokes	Romsey and Southampton North		whip restored on 29 October 2019	stood as a Conservative; retained seat
	Antoinette Sandbach	Eddisbury		joined Liberal Democrats on 31 October 2019[32]	stood as a Liberal Democrat;[23] lost seat to Conservatives, coming third behind Labour.
	Sir Nicholas Soames	Mid Sussex		whip restored on 29 October 2019	did not stand[33] later made a peer in the 2022 Special Honours as Baron Soames of Fletching.[34]
	Rory Stewart	Penrith and The Border			did not stand[35]
	Ed Vaizey	Wantage		whip restored on 29 October 2019	did not stand;[36] made a peer in the 2019 Dissolution Honours as Baron Vaizey of Didcot.[37]

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On 5 September, the Universities Minister Jo Johnson, who is also the Prime Minister Boris Johnson's younger brother, resigned from the Cabinet and stood down as an MP at the subsequent general election. The Daily Telegraph reported that Johnson's decision had been triggered by the suspension of Conservative MPs two days prior.^[38]

Two days later, the Work and Pensions Secretary Amber Rudd resigned from the Cabinet and surrendered the Conservative whip in Parliament in protest at Boris Johnson's policy on Brexit and the treatment of the 21 rebel MPs.^[39]

On 9 September, the bill was passed as the European Union (Withdrawal) (No. 2) Act 2019.

On 14 September, former Conservative leadership contender Sam Gyimah, who was one of the 21, joined the Liberal Democrats. On 4 October, former Cabinet minister and former Conservative leadership contender Rory Stewart resigned from the Conservative Party, in order to stand as an independent candidate for Mayor of London.^[40]

On 29 October, 10 of the MPs suspended from the party in September had the whip restored after meeting Boris Johnson. They were Alistair Burt, Caroline Nokes, Greg Clark, Sir Nicholas Soames, Ed Vaizey, Margot James, Richard Benyon, Stephen Hammond, Steve Brine and Richard Harrington.^[6]

On 31 October, Antoinette Sandbach joined the Liberal Democrats.^[32] On 5 November, Philip Hammond stood down as an MP at the forthcoming general election.^[24]

• List of elected British politicians who have changed party affiliation
• Maastricht Rebels