A spokesman for Iain Duncan Smith has accused ex-Liberal Democrat minister Sarah Teather of scaremongering, following her criticism of the government's benefit plans.
"The criticisms Sarah Teather is levelling against the Government's welfare reforms are hugely misinformed and therefore result in needless scaremongering," he told the Observer.
"It's not fair or right that benefits claimants receive higher incomes than hard-working families who are striving to get on in life. Our reforms bring fairness back to the system while ensuring we support the most vulnerable."
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Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.
Planning on going to the London Marathon tomorrow? Read our handy guide first!