Nigel Farage is set to challenge Sir Keir Starmer this week by pledging to scrap the two-child benefit cap and fully reinstate winter fuel payments for all pensioners.
The Reform UK leader's move will put fresh pressure on the Prime Minister, who is facing internal resistance over the potential £5billion cost of similar policy changes.
While Starmer is open to ending the two-child cap, Chancellor Rachel Reeves is reportedly reluctant to make an immediate announcement until funding can be identified.
The Reform leader's intervention comes as he attempts to appeal to traditional Labour voters, who he claims are increasingly turning to his party.
Farage will pledge to scrap the two-child benefit
GETTYFarage will use his first address since Reform's local elections success to launch his biggest attack yet on the Prime Minister.
He is expected to say: "Starmer is one of the most unpatriotic prime ministers in our history, and this past week has been evidence of that.
"The Prime Minister is out of touch with working people, he doesn't understand what they want and how they feel about the big issues facing Britain.
"It's going to be these very same working people that will vote Reform at the next election and kick Labour out of Government."
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Farage will commit to ending the two-child cap, which was introduced by the Conservatives in 2017 to limit benefits for families with more than two children.
A Reform source said: "We're against the two-child cap and we'd go further on winter fuel by bringing the payment back for everyone. That's already outflanking Labour."
Zia Yusuf, Reform's chairman, has indicated the party would fund these policies by cutting the foreign aid budget, closing asylum hotels and ending net-zero subsidies.
Farage has previously advocated for welfare and taxation systems that encourage families to have more children.
Starmer is under pressure to abolish the two-child benefit cap
PAStarmer is under mounting pressure to abolish the two-child benefit cap to appease as many as 150 Labour rebels who are threatening to vote down separate cuts to disability benefits.
While the Prime Minister backs ending the limit, he is reportedly facing pushback from his chief of staff, Morgan McSweeney, who is concerned about the £3.5billion cost.
It is understood that the cap will now be either watered down or abolished, but any announcement has been delayed until the autumn budget.
The delay has frustrated some Labour MPs who want immediate action.
Labour chairman of the Commons treasury committee, Dame Meg Hillier, said lifting the cap was "the only way we'll lift children out of poverty in this Parliament".
