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Amber Rudd could potentially lose her seat in Hastings and Rye, the BBC reports, citing sources at the count.
The Home Secretary was said to be in trouble after an exit poll showed the Conservatives falling short of the number of seats required to form a majority in Parliament.
It comes after the Green Party agreed to an alliance with Labour in a bid to oust Ms Rudd from her south coast constituency.
The exit poll suggests the Conservatives will be the largest party nationally with 314 seats, a loss of 17 seats, with Labour on 266, a gain of 34.
It also put the SNP on 34, the Lib Dems on 14, Plaid Cymru on three and the Greens on one.
Show all 38 Door of Number 10 Downing Street is seen on the morning after Britain's election in London
REUTERS
Labour leader Jeremy Corbyn leaves his home in north London after he called on the Prime Minister to resign, saying she should "go and make way for a government that is truly representative of this country"
PA
Shadow Chancellor John McDonnell arrives at Labour Headquarters on June 9, 2017 in London, England. After a snap election was called by Prime Minister Theresa May the United Kingdom went to the polls yesterday. The closely fought election has failed to return a clear overall majority winner and a hung parliament has been declared
Getty Images
Caroline Lucas, co-leader of Britain's Green Party, speaks after retaining her seat in the general election, in Brighton
REUTERS
Patrons watch the results for Britain's election in London
REUTERS
Leader of the Liberal democrats Tim Farron celebrates beating Conservative party candidate James Airey (R) following the announcement of the results at the Westmoorland and Lonsdale constituency count at Kendal Leisure Centre on June 9, 2017 in Kendal, United Kingdom. After a snap election was called, the United Kingdom went to the polls yesterday following a closely fought election. The results from across the country are being counted and an overall result is expected in the early hours
Getty Images
Paul Nuttal, leader of the United Kingdom Independence Party reacts after failing to win the seat of Boston and Skegness at the counting centre for Britain's general election in Boston
REUTERS
First Minister Nicola Sturgeon arrives at the Emirates Arena in Glasgow, as counting is under way for the General Election.
PA
Anna McMorrin hugs Jo Stevens MP after winning Cardiff North for Labour at the Sport Wales National Centre on June 9, 2017 in Cardiff, United Kingdom. After a snap election was called, the United Kingdom went to the polls yesterday following a closely fought election. The results from across the country are being counted and an overall result is expected in the early hours
Getty Images
Vince Cable wins the Twickenham election for the Liberal Democrats. Richmond and Twickenham election
Rex Features
Britain's Labour party leader Jeremy Corbyn rubs his face after arriving for the declaration at his constituency in London
AP
Emily Thornberry speaks after holding her Islington South and Finsbury seat at the Sobell Leisure Centre in Islington, north London
PA
Britain's Prime Minister Theresa May listens as the declaration at her constituency is made for in the general election in Maidenhead, England, Friday, June 9, 2017. British Prime Minister Theresa May's gamble in calling an early election appeared Friday to have backfired spectacularly, after an exit poll suggested her Conservative Party could lose its majority in Parliament
AP
Labour Party candidate Emily Thornberry smiles at a counting centre for BritainâÃôs general election in London
REUTERS
A picture shows the Elizabeth Tower, commonly referred to as Big Ben, and the Houses of Parliament in central London on June 8, 2017, on the night of Britain's general election. Prime Minister Theresa May is poised to win Britain's snap election but lose her parliamentary majority, a shock exit poll suggested on June 8, in what would be a major blow for her leadership as Brexit talks loom
AFP/Getty Images
DUP candidate for Lagan Valley Jeffrey Donaldson celebrates following his election at the Eikon Exhibition Centre in Lisburn as counting is under way for the General Election
PA
Britain's Home Secretary Amber Rudd attends the count for her seat at a counting centre for Britain's general election in Hastings
REUTERS
Ballots are counted at a counting centre for BritainâÃôs general election in London
Reuters
The London Eye is illuminated in blue, representing the Conservative Party, after the first exit polls announced in Britain's general election
AP
Election officials count votes in the Emirates Arena in Glasgow, Scotland
EPA
The London Eye is illuminated in red, the color of the Labour Party, after first exit polls of Britain's national election announced in London
AP
BBC Television centre is illuminated with the exit poll results for Britain’s general election
Eddie Keogh/Reuters
Labour’s Bridget Phillipson (centre) smiles after being announced as the winner of the election for the constituency of Houghton and Sunderland South at a counting centre
Reuters
Members of the election staff prepare to count ballots, in Theresa May’s constituency in Maidenhead
AP
Ballot papers are checked ahead of the count at the Westmoorland and Lonsdale constituency count at Kendal Leisure Centre
Getty
Ballots are counted at a counting centre for Britain’s general election in Kendal
Reuters
Theresa May arrives to vote at a polling station in Maidenhead
AP
Jeremy Corbyn arrives to cast his ballot at a polling station in north London
EPA
Lib Dems leader Tim Farron outside a polling station at Stonecross Manor Hotel in Kendal, Cumbria
PA
The leader of the United Kingdom Independence Party (Ukip) Paul Nuttall arrives to vote at a polling station in Congleton
Reuters
Scottish National Party leader Nicola Sturgeon with her husband Peter Murrell (left) the CEO of the SNP after casting their votes at a polling station at Broomhouse Community Hall, Glasgow, Scotland
EPA
Caroline Lucas, co-leader of Britain’s Green Party, arrives with her husband Richard Savage, to vote in Brighton
Reuters
An advertising van showing caricatures of Tim Farron, Theresa May, Jeremy Corbyn and Paul Nuttall with the message who will be looking for a new job as Britain goes to the polls to elect a new government
Rex
Performers pose with puppet caricatures of Britain's Prime Minister Theresa May, leader of the Liberal Democrat Party Tim Farron and leader of the Labour Party Jeremy Corbyn, in front of the Palace of Westminster
Reuters
Dogs wait for their owner outside a polling station in Penally, Wales
Reuters
Police officers speak with a Labour Party activist outside a polling station in London
AP
Benedictine nuns from Tyburn Convent leave after voting in Britain's general election at a polling station in St John's Parish Hall, London
AP
A polling station sign is seen on a telephone box outside the polling station at Rotherwick Hall, west of London
Getty
Theresa May repeatedly urged voters to hand her a large majority so that she could go into talks in Brussels with the firm backing of the country and the House of Commons behind her.
She claimed that if she lost just six seats, she would no longer be Prime Minister, and an unprepared Jeremy Corbyn would go "naked and alone" to the negotiating table
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