The government's Welfare Reform Bill faces pressure as it comes before the House of Lords, where there will be a discussion on the replacement of Disability Living Allowance with a Personal Independence Payment.
Home Affairs editor Mark Easton gives his analysis of the proposed changes.
Lord Colin Low, president of the Disability Alliance, told the Today programme's James Naughtie that the Welfare Reform Bill was being "rushed through to meet Treasury targets".
He went on to say that reforms are a "work in progress" and disabled people "don't have confidence" that the government will provide a fair support assessment system.
But minister for Disabled People Maria Miller said that the existing Disability Ability Allowance is 20 years old and therefore "outdated".
She also said that the existing system allowed people with disabilities to "fall through the net" including those with mental illness.
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