Ian Blackford has called on Foreign Secretary Dominic Raab to resign for putting "lives at risk" over his handling of the crisis in Afghanistan.
The Tory minister has been slammed by opposition MPs for reportedly being "unavailable" when officials in his department suggested he "urgently" call Afghan foreign minister Hanif Atmar on August 13 - two days before the Taliban marched on Kabul - to arrange help for those who supported British troops.
It was initially reported the Afghan Foreign Ministry refused to arrange a call with a junior minister, pushing it back to the next day.
But a Foreign, Commonwealth and Development Office spokesperson later said: "Given the rapidly changing situation, it was not possible to arrange a call before the Afghan government collapsed."
Raab was holidaying on Crete and said to be staying at the five-star "luxury" Amirandes Hotel when the request for the call was made.
The Times also reported that Sir Philip Barton, Matthew Rycroft and David Williams, the respective permanent secretaries of the Foreign Office, Home Office and Ministry of Defence, were on holiday amid the evacuations from Afghanistan.
It is understood the senior officials continued to work on Afghanistan while on leave, with the Whitehall departments running systems where there is another minister or an acting permanent secretary to cover periods of leave.
However, it has emerged a phone call requested by Raab 's officials to help interpreters flee Afghanistan was not made.
Following the recent revelation of Raab's handling of the crisis, the SNP has renewed its calls for Boris Johnson to sack the senior minister.
The SNP's Westminster leader Ian Blackford said: "It is utterly unforgivable that when Afghanistan was falling, Dominic Raab was too busy relaxing on a sun lounger in a five-star luxury holiday resort to fulfil the basic duties of his job.
"The Foreign Secretary has put people's lives at risk and he must go - or he will do long-term damage to his role and the credibility and authority of the Tory government.
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"This is a serious question of judgement for Boris Johnson. If Mr Raab doesn't resign - he must be sacked, or the Prime Minister's own position will become even more precarious.
"The UK government shares responsibility for the biggest foreign policy disaster of modern times. It beggars belief that arrogant Tory ministers jetted off on holiday instead of leading efforts to protect the soldiers, interpreters and vulnerable Afghan citizens that they had abandoned.
"It is essential that the UK government radically improves its support for vulnerable Afghan citizens by at least doubling the number of refugees it has pledged to take, reversing Tory cuts to foreign aid, and working with international partners to protect human rights and ensure safe routes out of Afghanistan."
Earlier today defence minister James Heappey said people at all levels in the UK Government are "working their backsides off" to evacuate people.
He told Sky News: "I don't know the exact details of the Foreign Office ministers' call sheets.
"What I can tell you, as the Secretary of State ( Ben Wallace ) said yesterday, is I know that no one phone call would have been decisive in changing the trajectory - either for the collapse of the Afghan government or indeed the acceleration of the airlift."
Heappey added he could only comment on what he sees in his meetings and via his phone calls.
He said: "What I see is that from the Prime Minister to secretaries of state to my junior ministerial colleagues around government to senior civil servants, all the way down to the brave volunteer civil servants who have gone forward to Kabul...is people across Her Majesty's Government working their backsides off in order to get people out."
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