Labour leadership hopeful Lisa Nandy will say the UK should hold out on signing a trade deal with the US if Donald Trump carries out his vow to withdraw from the Paris Agreement on climate change.

In a speech in London, the Wigan MP will say Labour should rule out signing trade deals with countries that fail to sign up to the vital climate accords, which committed nearly 200 nations to keeping rising global temperatures below 2C.

The US provoked widespread concern when it gave notice of its intention to leave the agreement last year, saying the 2015 agreement placed an “unfair economic burden” on the US economy.

Ms Nandy will say the UK needs to "call out the behaviour of one of our closest allies" regardless of the economic consequences, as she continues her bid to succeed Jeremy Corbyn at the top of the Labour party.

A post-Brexit trade deal with the US is highly prized by Brexiteers but critics have warned that such an agreement could lead to a lowering of food and environmental standards in the UK.

However ministers have vowed that the UK will not allow the import of chlorinated chicken or hormone-fed beef in the event of a deal with the US. Trade talks will begin in earnest once the UK leaves the EU officially on 31 January.

In a speech to the Royal Society of Arts in London, Ms Nandy is expected to say: "To take people with us we need to show we’re willing to live our values and stand by them. Even when they have economic consequences, or when we have to call out the behaviour of one our closest allies.

"We cannot turn up at the G20 and pledge our commitment to the Paris Agreement while continuing to use government money to invest in fossil fuel projects overseas. Or export plastic waste to dump it in South East Asia.

"As we look to forge new trading alliances across the world, we will need to make choices. We should be clear now: we will refuse to agree any trade deal with a country that has not ratified the Paris Agreement.

"It is easy to blame Trump as a single destabilising force. But the UK should not rest on this as an excuse for lack of action on a global level."

It comes after Ms Nandy's campaign won a boost with an early endorsement by the National Union of Mineworkers (NUM) on Tuesday.

The battle to replace Jeremy Corbyn as Labour leader Show all 8 1 /8 The battle to replace Jeremy Corbyn as Labour leader The battle to replace Jeremy Corbyn as Labour leader Keir Starmer The former director of public prosecutions undoubtedly has announced that he is standing for the leadership. He is highly-regarded by both left-wingers and centrists in the party. As Labour’s shadow Brexit secretary, he played a key role in the party’s eventual backing of a second referendum. Before becoming an MP, he was a human rights lawyer - conducting cases in international courts including the European Court of Human Rights. Launching his bid, Starmer said that Labour must listen to the public on how to change "restore trust in our party as a force for good." A YouGov poll places him comfortably in the lead as the preferred candidate of 36% of party members EPA The battle to replace Jeremy Corbyn as Labour leader Lisa Nandy Wigan MP Lisa Nandy has announced she wil stand for the leadership. In a letter to the Wigan Post she said she wanted to bring Labour "home" to voters in its traditional strongholds who have abandoned the party. Nandy went on to say that she understands "that we have one chance to win back the trust of people in Wigan, Workington and Wrexham." A YouGov poll shows that Nandy is the first preference for 6% of partymembers. Getty The battle to replace Jeremy Corbyn as Labour leader Rebecca Long Bailey A key ally of the current left-wing leadership of the party, the Salford & Eccles MP is viewed in some quarters as the natural successor to Mr Corbyn and describes herself as a “proud socialist”. Highly regarded by the shadow chancellor, John McDonnell. She won also won plaudits for her performance filling in for Corbyn both at prime minister’s questions and during the general election debates. The shadow business secretary grew up by Old Trafford football ground and began her working life serving at the counter of a pawn shop. Launching her leadership bid, Long Bailey said the party needs to make the positive case for immigration as a "positive force." She also broke with Corbyn over Trident, saying "If you have a deterrent you have to be prepared to use it." PA The battle to replace Jeremy Corbyn as Labour leader Angela Rayner - Deputy leadership Shadow education secretary Angela Rayner has joined the contest for deputy leadership of the party. After ruling herself out of running for the leadership, the Ashton-under-Lynne MP launched her bid for deputy warning that Labour faces the "biggest challenge" in its history and must "win or die." She is close with leadership contender Rebecca Long Bailey PA The battle to replace Jeremy Corbyn as Labour leader Rosena Allin-Khan - Deputy leadership Shadow sport minister Rosena Allin-Khan said Labour need to listen with "humility" to lost voters as she launched her bid for the deputy leadership. Writing in The Independent, the MP for Tooting refelcted: "We shouldn’t have ignored the warning signs in Scotland, and now we’ve paid the price in northern England, across the midlands and in Wales." PA The battle to replace Jeremy Corbyn as Labour leader Dawn Butler - Deputy leadership Shadow women and equalities secretary Dawn Butler was first to announce her bid for the deputy leadership. The Brent Central MP has served in Jeremy Corbyn's shadow cabinet since 2016 PA The battle to replace Jeremy Corbyn as Labour leader Ian Murray - Deputy leadership Labour's only MP in Scotland said that the architects of the party's "catastrophic failure" in the December election can not be allowed to lead the party forward PA The battle to replace Jeremy Corbyn as Labour leader Richard Burgon - Deputy leadership Shadow justice secretary Richard Burgon is standing as a continuity candidate, flaunting his loyalty to Jeremy Corbyn and saying it is wrong to blame the current leader for the election defeat PA

Union support is crucial to the five candidates vying to be leader, as party rules say each candidate must win the support of 5 per cent of constituency parties and affiliated groups, including two trade unions.

Sir Keir Starmer, the shadow Brexit secretary, emerged as an early frontrunner in the race when he won the backing of Unison, the UK's largest union, while Rebecca Long-Bailey is widely seen as the left-wing successor to Mr Corbyn.

Prominent backbencher Jess Phillips and Emily Thornberry, the shadow foreign secretary, both won enough support from MPs to pass the first hurdle, setting up for a five-way contest.

The new leader will be announced at a special conference on 4 April, after being elected by Labour members.