David Cameron was asked if he would stay on as Prime Minister until 2020, and he told the Sunday Telegraph:
Yes - look, I want to fight the next election, win the next election and serve - that is what I want to do.
Mr Cameron and Deputy Prime Minister Nick Clegg will publish a review on Monday of progress the Coalition government has made since 2010 and set out its top priorities for the rest of their term.
"This is an enormous reform agenda and that's enough to keep us all busy."
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.