The shadow chancellor said talking to local communities showed tackling climate change to be the “number one priority” in every UK region.
He said the Institute for Fiscal Studies failed to look at the complete Labour policy before passing judgement on its manifesto.
The shadow chancellor has condemned the Prime Minister's speech at the Conservative Party conference.
The shadow chancellor has slammed the Lib Dems as an "extreme right-wing austerity party", saying their Brexit policy is "unacceptable".
Lib Dem Christine Jardine said a "large section" of Scotland would struggle to forgive Labour if it allowed a second independence vote.
Labour's shadow chancellor said his party would not block a second vote on Scottish independence in a bid to get the SNP on side.
John McDonnell is facing calls to sever ties with a Labour group criticised for supporting an activist accused of antisemitism.
The shadow chancellor revealed he was "shocked" when he heard Amber Rudd refer to Diane Abbott as a "coloured woman" in an interview today.
Conservative MP Bob Stewart has described John McDonnell’s comments about Winston Churchill as “rubbish” and a “slur”, after the shadow chancellor called the wartime prime minister a “villain”.
Luciana Berger is facing a vote of no confidence in her constituency amid reports she could be associated with a 'breakaway party'
Shadow chancellor John McDonnell said that Labour could call further confidence votes in the government if Theresa May wins the one tabled by Jeremy Corbyn on Wednesday
Protesters have gathered in London for a “yellow vest” inspired anti-austerity march.
Leave campaigner Kate Hoey and Remainer Jim Fitzpatrick MP joined Julia Hartley-Brewer to discuss a second referendum
Labour's Shadow Chancellor has said the Party's nationalisation plans will stop people feeling "absolutely ripped off".
Shadow Chancellor John McDonnell has written to Treasury Secretary Tom Scholar asking for an urgent meeting in case the government collapses over Brexit deal
Shadow Chancellor John McDonnell has said that he “could palpably feel the vote was gone” for Remain before the EU Referendum result was in.
An entry in the biographical database Who's Who says John McDonnell's hobby is 'fermenting the overthrow of capitalism'
Conservative deputy chairman James Cleverly says the Labour party's financial plans are 'pie-in-the-sky' ahead of the Autumn Budget 2018
Shadow chancellor John McDonnell said the Labour Party's ban of Julia Hartley-Brewer from their next conference was because she didn't 'behave acceptably'
Labour is not trying to “frustrate” the process of leaving the European Union despite keeping open the option of a referendum on remaining in the EU, the Shadow Brexit Secretary has said.
A Labour-organised festival, nicknamed “JezFest” did not make a profit, the party’s treasurer has confirmed.
Some of the key policies Labour has covered at its annual conference so far include a second home tax, alcohol care, and a preference for a general election over a second Brexit referendum
John McDonnell has said that he thinks the next Labour leader should be a woman but that Jeremy Corbyn “will be the leader” as they go into the next election.
John McDonnell, the Shadow Chancellor of the Exchequer has said that workers could be £500 a year better off under Labour’s new plans to expand employee ownership of large companies.
John McDonnell has said that the Labour party is pressing “for a General Election” but would “push for a People’s Vote” if they don’t get an election.
Robert Halfon MP told Julia Hartley-Brewer that 'Corbynistas' encourage aggression against Conservatives
Simon Johnson, chair of the Jewish Leadership Council, said Jeremy Corbyn's 2013 speech in which he said British Zionists "don't understand English irony" were unacceptable
The rally, backed by left-wing pressure group Momentum, echoed shadow chancellor John McDonnell's repeated demands for an extraordinary budget.
Burnham also backs John McDonnell's plan to lecture World Economic Forum on inequality
James Cleverly claims people like John McDonnell are setting a bad example
Julia Hartley-Brewer suggests Toby Young has been unfairly tweeted and asks critic Lord Adonis 'how can we censor a man who tweets about women's breasts yet allow John McDonnell to call for lynching Tories'
McDonnell and Labour are urging Hammond to reverse a tax cut for Britain's banks
Comments in recent days from key figures have suggested the party would favour continued membership in the single market
New research ridicules John McDonnell's claim that Labour's spending package would 'pay for itself'
Liz Truss claims John McDonnell's plan would mean borrowing 'billions more and hike up taxes to record levels'
The MP for Bootle spoke to Julia Hartley-Brewer about John McDonnell's demands for the economy ahead of the budget's unveiling
Caller Mark said Corbyn is in fact a puppet of the establishment
Richard Murphy, a professor of political economics, spoke to Julia Hartley-Brewer about the Labour shadow chancellor's declaration of being prepared for a drop in the pound's value
Film director Ken Loach says there is no anti-Semitism in the Labour Party
Special correspondent for the New Statesman Stephen Bush says Labour's conference has a different atmosphere this year
McDonnell says delegates determine which topics are discussed at conference and Labour are 'building consensus' - unlike Tories
Tony Blair's former spin director says new Labour rule-change is overly defensive
The national executive committee is set to implement a rule change to allow for a leftwing successor to the Labour Leader
Journalist Christian Wolmar slams 'Daily Mail story' says John McDonnell wasn't calling for violence during a speech
John McDonnell says cabinet ministers are scrapping in the playground and the Government is chaotic
A demonstration against Theresa May's deal with the DUP has been arranged by The People's Assembly
The shadow chancellor said the victims of the tower fire had been 'murdered' by 'political decisions'
The group organised the controversial Day of Rage protest in response to the Grenfell Tower fire on the same day as the State Opening of Parliament
Paul Staines believes McDonnell has created a 'hostage to fortune' with his comments about the protest
The Labour leader's declaration comes in the wake of a new Survation poll showing his party has pushed ahead of the Tories by six points
Labour's Shadow Chancellor said the people thought her call to an election for 'party-political advantage' was 'inappropriate'
Jeremy Corbyn and shadow chancellor John McDonnell included a number of lavish spending pledges in their manifesto. But do the numbers stack up?
The Labour leader took part in the Leaders Debate on Channel 4 News and Sky News on Monday