U.K. Chancellor Philip Hammond | Glyn Kirk/AFP via Getty Images Philip Hammond: No-deal Brexit would betray referendum result Cabinet to discuss ‘bold’ new Brexit offer.

A no-deal Brexit would be a betrayal of the 2016 EU referendum result, U.K. Chancellor Philip Hammond will warn on Tuesday evening.

"The 2016 Leave campaign was clear that we would leave with a deal. So to advocate for no-deal is to hijack the result of the referendum and, in doing so, knowingly to inflict damage on our economy and our living standards," Hammond will say in a speech to the annual dinner of the Confederation of British Industry, the Guardian reported.

The chancellor's remarks will be seen as a broadside against those on the right of the Conservative Party — as contenders jostle to succeed Theresa May as party leader — and the populist Brexit party, which advocates leaving the EU with no deal.

“I will continue to fight, in the face of this polarization, for a negotiated Brexit; an outcome that respects the British people’s decision to leave, while recognising that there is no mandate for a no-deal exit," Hammond will tell the business audience.

May chairs her Cabinet on Tuesday to seek support for what she has called a “bold” new package of measures aimed at winning the backing of scores of Labour MPs when the Withdrawal Agreement Bill is put to the House of Commons in early June. Those measures are expected to include key Labour demands on workers’ rights and the environment, and maybe even a customs union lasting until 2022.

Ahead of those Cabinet talks, Commons leader Andrea Leadsom warned the prime minister against opting for a formal customs union with the EU.

Asked on the BBC's Today program if she would back May's Withdrawal Agreement Bill, Leadsom said: "I will want to see, No. 1: that it delivers Brexit. On the other hand, No. 2: I know that some of the measures in the bill will be to promote alternative arrangements to the [Northern Irish] backstop ... I know that it will seek to enshrine in law the environmental goods that we all want to see ... it'll have in it measures to enshrine workers' rights ... so all of those things will be attractive to many members across the house ... But absolutely key for me is that it does deliver Brexit."

Leadsom said the party's election manifesto states clearly that the U.K. would leave the single market and the customs union, but she noted that possible future customs arrangements would allow Britain to pursue post-Brexit trade deals.

"I would define the difference between customs union and a customs arrangement as being: in a customs arrangement you can still write your own free trade deals with the rest of the world," Leadsom said.

Speaking on the same program, Labour's Emily Thornberry, the shadow foreign secretary, said her party would vote against the bill.

“From what I’ve heard, there’s really no radical difference [from what’s already been defeated by MPs three times]. Labour MPs will vote against it, Tory MPs will vote against it. I’m afraid it’s almost a kind of piece of political theatre ... it’s almost like she [May] is setting up her own political version of the last rites.”

“The only way of moving forward is to go back to the people and ask for their help [in a second referendum]," Thornberry said.