Secretary of State for Scotland David Mundell said:
"David Cameron has been a great leader of my Party and of our country. I was proud to be one of his first supporters during the 2005 leadership election and I have never regretted that decision for a moment. His achievements in rescuing our economy and in social reform will stand the test of time. Today he has once again put country before self.
"As the Prime Minister made clear this morning, the UK Government is absolutely committed to working closely with the Scottish Government to ensure they are fully involved in the negotiation process. The Prime Minister has already spoken to the First Minister and I have today offered to meet with the Scottish Government in Edinburgh to discuss next steps.
"The United Kingdom has fundamental strengths and this is a time for calmness and deliberation – not pushing other personal or political agendas."
Source: Gov.uk (Contains public sector information licensed under the Open Government Licence v3.0.)