The Government says 40,000 households will be affected by the new benefits cap, which is being trialled from Monday.
ITV News Reporter Sejal Karia has spoken to one family fearing for their future:
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Ursula Keogh, 11, went missing on Monday around 3.30pm. She was dressed in her school uniform.
"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.