The government is facing pressure to do more, following worsening economic warnings.
"My job is to make sure that when the new prime minister arrives, the plan is in place for them to put their foot on the accelerator," he told the BBC's PM programme.
"The economic situation people and businesses are facing requires all hands to the pump this summer," he said. The organisation also said Mr Johnson, Mr Sunak and Ms Truss should agree "a way forward to support people and businesses with energy bills" ahead of 26 August, when Ofgem is due to announce the next energy price cap.
Speaking to the BBC's World This Weekend programme on Sunday, Mr Brown said there was "a vacuum" in government because "the prime minister is on holiday, the chancellor is on holiday, the two leadership candidates for prime minister are on the campaign trail."Asked if Mr Johnson - who has returned from a holiday in Slovenia - would summon a meeting of Cobra, No 10 said it would be up to Mr Johnson's successor to make any decisions on further support for households.
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