The controversial test on whether people are fit to work will be debated in the House of Commons today.
Speaking to ITV Daybreak, Simon Gillespie from the MS Society said that the criteria needs to be fitting for the task.
He added that people should be assessed in some way to ensure the benefits they receive are deserved.
More top news
Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.