The Conservative MP, who was a member of the official Brexit campaign, slammed his Labour Party counterpart, who has been part of a movement to ensure the service’s extra funding is guaranteed.
Mr Umunna, the former shadow business secretary, failed in his bid to table an amendment on the Government’s bill to guarantee the funding – voted down in the Commons by 337 to 288 votes.
He then railed against suggestions that Nigel Farage had said there is no way the Vote Leave promise can be delivered, the former Work and Pensions Secretary said the former Ukip leader is quick “to say one thing one moment and then turns round and says another thing”.
Chuka Umunna and Iain Duncan Smith clashed as they failed to agree on a £350-a-week Brexit pledge
Your amendment didn’t commit the Government to spending the money
Iain Duncan Smith
“I agree with what I said at the time, we want for money for [the NHS]," he added.
Given his own chance to reply, Mr Umunna answered: “I think there is a bit of pot and kettle going on here with Iain Duncan Smith accusing Nigel Farage of saying one thing one moment and changing his mind.
“He happens to have taken your party by hostage, but that’s another matter.
“All of you guys go up and down this country in your big, fat, red bus and here you had an opportunity to give a strong indication to the people of this country that you’ll keep your promise, you would ensure your party would put £350m-a-week into the NHS and you walked away from it."
The Vote Leave bus became a centre piece of the EU campaign
The Brexiteer fired back: “Let me make a judgement about this.
Get Quotes on Home Insurance
“This is getting a little bit portentous and pompous… Chuka, your amendment didn’t commit the Government to spending the money, all you wanted was for the Government to publish some kind of report.
“There’s nothing better than to tell the world that I believe when we leave and take back our control and our money, we can then spend that on our priorities here – that’s what people voted for."
The Vote Leave slogan, which has been heavily criticised, was recently defend by Vote Leave chair Gisela Stuart.
REMOANERS: These people hate BREXIT! Mon, January 16, 2017
Remainers are finding it hard to accept Brexit.
AFP/Getty Images 1 of 14
The Labour Brexiteer, who toured the country in the bus, told Express.co.uk she was unconcerned by the torrent of abuse aimed at the campaign.
“I always regard it as a minor sport because I am still very happy to defend that,” she said.
“The official statistics say that gross contribution is £19.2billion – that over which we have no control – I would spend more on the NHS.”
- Vote Leave chair SLAPS DOWN Clegg’s criticism of '£350m' NHS slogan
- Emergency! One in six hospital A&E departments 'may be closed'
- Nicholas Soames demands compulsory health insurance for foreigners