Tory backbencher Liam Fox has lost out in the first round of the competition to become Conservative party leader and Prime Minister.
Fox will now be eliminated from the next round of voting, while all candidates will have the option of withdrawing before a second ballot on Tuesday.
Meanwhile, home secretary Theresa May was the clear winner in the first vote, with 165 MPs declaring their support for her.
Her tally dwarfed that of her nearest rival, energy minister Andrea Leadsom, who came second with 66 backers.
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The pair were pursued by justice secretary Michael Gove and work and pensions secretary Stephen Crabb with 48 and 34 votes, respectively.
Fox secured the backing of just 16 MPs.
In the first ballot of the 2005 leadership contest, Fox secured the backing of 42 MPs, coming third in a field of four.
Eventual winner David Cameron came second, with David Davis securing the greatest support from the party's parliamentarians.
THE FULL RESULTS
- Theresa May - 165
- Andrea Leadsom - 66
- Michael Gove - 48
- Stephen Crabb 34
- Liam Fox - 16