Several of Johnson's own Conservative MPs express alarm about breaking international law, while every living former prime minister of Britain also warned of the risk to Britain's global reputation.
Former British leaders have joined those slamming PM Johnson's government for trying to rewrite the Brexit withdrawal treaty.
Prospects of a trade deal between Britain and the European Union look to be dimming.
The warnings came as the UK government published legislation that it admits breaks international law.
A staunch Eurosceptic and Atlanticist, Fox is one of eight nominees to replace outgoing director general Roberto Azevedo.
The two nations hope to clinch a deal before Britain's transition out of the European Union concludes at the year end, to avoid any gaps in bilateral trade arrangements.
Turkish Foreign Minister Mevlut Cavusoglu held the latest round of trade talks with British Prime Minister Boris Johnson and Foreign Secretary Dominic Raab this week during a visit to London
The EU and Britain are currently in negotiations to agree on a basis of trade relations after a post-Brexit transition phase ends on December 31.
Britain will instead introduce a temporary "light-touch regime" at ports such as Dover for incoming EU goods, the Financial Times newspaper reported, adding that this will happen whether or not there is a Brexit free trade agreement with the EU.
Panicky and desperate moves by Brussels to bully Boris Johnson are going to backfire.
Britain left the EU in January, and talks with the bloc are now focused on setting new trading terms from 2021, when London's status-quo transition period ends.
The new blue cover passports will be issued and delivered early next month and will be replacing the burgundy passports that were introduced in 1988.
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