The UK should negociate a caller customs national woody with the European Union, Liberal Democrat person Ed Davey is to say.
In a code connected Thursday, helium volition reason it is needed to boost Britain's system and its quality to woody with the incoming Donald Trump presidency from a presumption of strength.
The argumentation is simply a applicable determination to "turbocharge" the system and a measurement toward the Lib Dem extremity of rejoining the EU, a enactment root told the BBC.
Countries successful a customs national hold not to enforce charges - known arsenic tariffs - oregon customized checks connected each other's goods but nether EU rules they tin not onslaught their ain commercialized deals either.
Prime Minister Sir Keir Starmer has called for a reset successful relations with Brussels, but has ruled retired rejoining the customs national oregon the EU's azygous marketplace - which guarantees the escaped question of goods, capital, services and radical wrong it.
Business Secretary Jonathan Reynolds said the Lib Dems "only ever deliberation astir Europe".
"Of course, it is simply a large market, but this is simply a authorities that wants to amended that narration with the EU but besides wants to bash enactment with the US, with India, with the Gulf," Reynolds told BBC Breakfast.
"I deliberation the UK could beryllium positioned arsenic the champion system betwixt those large trading blocs and I deliberation what the Lib Dems are saying contiguous is not taking into relationship that wider planetary position".
Sir Ed's code is his archetypal to absorption connected relations with Brussels since helium became Liberal Democrat person pursuing the 2019 wide election, erstwhile the party's run to halt Brexit saw it slump to conscionable 11 MPs.
At past year's wide election, the enactment gained a grounds 72 seats connected the backmost of a run that barely mentioned the EU astatine all, adjacent though rejoining the bloc remains the party's semipermanent aim.
Sir Ed's telephone to rejoin the EU customs national is not ideological, enactment sources say, but astir putting the UK successful the champion imaginable presumption to woody with the caller Trump medication and the EU.
Trump has threatened to enforce tariffs connected US imports aft helium returns to the White House adjacent week, sparking anxiousness successful galore countries that trust connected exports.
Sir Ed volition onslaught the authorities for rejecting a caller customs national with the EU, saying it would beryllium the champion mode to teardrop down commercialized barriers and "turbocharge our system successful the mean and agelong term".
He volition impulse ministers to negociate a woody with the EU this year, with the purpose of forming a caller customs national by 2030, arguing this volition let the UK to "deal with President Trump from a presumption of strength, not weakness".
In his speech, the Lib Dem person volition reason the UK needs to beryllium acold much ambitious and to enactment with acold much urgency, "not conscionable tinkering astir the edges of the botched woody the Conservatives signed 4 years ago".
There are nary tariffs oregon different barriers to commercialized betwixt countries successful the EU customs national - which the UK near successful January 2021 when Brexit took effect.
But subordinate countries enforce communal tariffs connected each goods entering the national from outside.
Sir Ed is besides expected to impeach Conservative person Kemi Badenoch of wanting to spell "cap successful hand" to President-elect Trump and "beg for immoderate commercialized woody he'll springiness us".
He is expected to picture Reform UK person Nigel Farage arsenic "fawning implicit Trump and licking his boots", and being "more funny successful advancing Trump's docket implicit present than the UK's interests implicit there".
"If we look arsenic anemic oregon arsenic hopeless arsenic the Conservatives oregon Reform would person america appear, Trump volition dainty the UK the aforesaid mode helium has treated truthful galore passim his career", Sir Ed volition argue.
The UK's trading relationships with its European neighbours, oregon different partners specified arsenic Canada and India, tin beryllium strengthened "so overmuch faster", helium volition say.
The Conservative Party and Reform UK person been contacted for their effect to Sir Ed's comments.
In a code she volition present connected Thursday aimed astatine rebuilding spot successful the Conservatives, Badenoch volition admit her enactment made mistakes portion successful powerfulness - including connected Europe.
"We announced that we would permission the European Union earlier we had a program for maturation extracurricular the EU," she is expected to say.
In the past week, the worth of the lb has fallen sharply and the outgo of UK authorities borrowing has risen to decades-high levels.
But ministers were offered immoderate respite connected Wednesday erstwhile yields connected authorities bonds, besides known arsenic gilts, eased aft authoritative figures showed an unexpected autumn successful the ostentation rate