The UK’s withdrawal of troops from Afghanistan has been called Britain’s biggest foreign policy disaster for 65 years.
Conservative Party MP Tom Tugendhat, chairman of the Foreign Affairs Committee, made the comments as the Taliban seized control of Afghanistan.
Its fighters took over the capital Kabul at the weekend, sparking chaotic scenes at the city’s airport as thousands of people try to flee the country.
The Taliban has swiftly seized control of the country in recent days, forcing president Ashraf Ghani to flee to neighbouring Tajikistan.
British troops entered Afghanistan with their American counterparts in 2001 in the wake of the 9/11 terror attacks. The Taliban fled Kabul in November of that year.
In 2006, British troops moved into Helmand Province where their base of Camp Bastion was built.
By 2010, there were more than 10,000 UK troops in Afghanistan, as fighting against the Taliban continued. But after a transition of security to the Afghan government, British troops ended their combat role in October 2014.
Tugendhat said the withdrawal was the UK’s worst foreign policy disaster since the Suez crisis of 1956, when Britain failed to invade Egypt in an attempt to regain control of the Suez canal.
He told the BBC on Sunday that the UK had “abandoned the Afghan people”.
He also criticised foreign secretary Dominic Raab, saying: "We haven't heard from the foreign secretary in about a week, despite this being the biggest single foreign policy disaster since Suez, so I don't know what the Foreign Office is thinking."
Later, Raab said he had "deep concerns about the future for Afghanistan" and that the international community must be “united in telling the Taliban that the violence must end and human rights must be protected".
Raab had faced a backlash for remaining on holiday while the Taliban took over Afghanistan.
Former Labour Defence secretary, Lord Robertson of Port Ellen, said: "It is stunning that the foreign secretary would stay on holiday as our mission in Afghanistan disintegrated.
"The fact that the foreign secretary is missing in action shows graphically the lack of purpose in our government's attitude to what we set out to do twenty years ago."
Parliament will be recalled on Wednesday for one day for MPs to discuss the situation in Afghanistan.
Watch: Chaos at Kabul airport as thousands try to flee Afghanistan