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Green Party health spokesperson and GP Dr Jillian Creasy accused the government of “locking in” the crisis in the NHS with the changes, which could see junior doctors' pay cut by up to 30 per cent.

Express.co.uk highlighted the changes are likely to spark a crippling exodus of NHS staff – leaving Britain with a severe shortage of health workers which can only be stopped with costly locum and foreign workers.

The Green Party support comes after medics and patients penned emotional letters to Mr Cameron warning him his ideological drive to force younger doctors to work more hours for less pay will likely have a devastating effect.

Caroline Lucas’ group is now joining the fight against new legislation proposed by David Cameron’s “short-sighted” Government, which Express.co.uk has already warned will put patients' lives at risk after launching a crusade the stop the changes.

The plans would see doctors' pay cut by up to 30 per cent

This short-sighted government is constantly expecting the NHS to do more with less

Dr Creasy said: “This short-sighted government is constantly expecting the NHS to do more with less.

"Our NHS is in crisis, and by failing to invest in junior doctors, the government is locking this crisis in for years to come, as more junior doctors move abroad or simply quit.

“The Green Party stands with junior doctors, and supports their plans for industrial action over the planned changes to their contracts.

“These changes would be detrimental to the health of both junior doctors, who already work very long hours, and patients, whose safety will put at risk.

“Jeremy Hunt must urgently change his position on this, and listen to the professionals who understand the implications of his politically-motivated plans.”

Health Secretary Jeremy Hunt wants to change Junior Doctors' contratcs so they work longer hours, with one of the most contentious reforms being the reclassification of Saturday as a working day.

Junior Doctors already work 56 hours a week for a salary as low as £22,000, with many also putting in hours of unpaid overtime.