GETTY Theresa May could be ousted as Prime Minister, according to reports

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Eurosceptic MPs are prepared to challenge Mrs May’s leadership if she fails to deliver on her original plan. Many Eurosceptics have made it clear they will only support Mrs May if she fulfils the terms she set out in her Lancaster House speech. In her speech in January, Mrs May said the UK must leave the single market and customs union, while also promising to bring an end to freedom of movement, as well as European Court of Justice’s reign over Britain.

An influential former minister is said to have likened the plot to Sir Anthony Meyer’s 1989 challenge against Margaret Thatcher. The revelation comes after the Prime Minister faced fierce criticism for not meeting those affected by the Grenfell Tower blaze sooner. Damian Green, the First Secretary of State, defended Mrs May on Saturday, saying she was “distraught” about the fire.

GETTY The Prime Minister faced criticism for not meeting those affected by the Grenfell Tower blaze sooner

Hundreds descend on Parliament to protest Theresa May's DUP deal Mon, June 12, 2017 Crushed by an election gamble that backfired and triggered calls for her resignation, Theresa May stood by her vow to form Britain's next government and lead the country out of the European Union Play slideshow Getty Images 1 of 9 Protesters march against the Conservative party alliance with the DUP

Liam Fox, the International Trade Secretary, said the UK must be able to sign free trade deals after Brexit – which means leaving the customs union. Dr Fox said: “We want Britain to be able to negotiate its own trade agreements, and as we leave the European Union that is what we will do.” Yet Chancellor Philip Hammond is expected to appear today’s Andrew Marr Show to argue Britain needs a softer Brexit, emphasising the need to preserve free trade links with the EU.

GETTY Liam Fox said the UK must be able to sign free trade deals after Brexit