In a letter sent to Tory members seen by Sky News, the Conservative Party's head of membership confirmed postal ballots will arrive 'a little later than we originally said' as 'we have taken some time to add some additional security' to the process.
It comes as Mr Sunak battles to make up ground during what is a key week in the contest for the keys to Number 10.
The latest YouGov poll of Conservative members for The Times newspaper shows Ms Truss's lead has stretched to 34 points in the Tory leadership race, with 60% of party members now saying they will vote for the foreign secretary to succeed Boris Johnson as prime minister.The poll, carried out over the last five days, shows Ms Truss is now ahead of Mr Sunak among all age groups, across different parts of the country and with men and women.
But it will concern both potential leaders that more than 50% of party members believed whoever was elected to succeed Mr Johnson would lose the party its majority at the next election. Just 19% of members thought Mr Sunak could lead the Tories to victory, while 39% thought Ms Truss could see off a challenge from Labour.As the leadership race continues to heat up, Mr Sunak and Ms Truss will once again face the cameras this week on Sky News.
Taking place on Thursday 4 August at 8pm at Sky Studios in west London, The Battle for Number 10 will see the candidates take part in back-to-back questioning from the live studio audience made up of Conservative Party members who remain largely undecided on who to vote for.The programme will be broadcast live for 90 minutes and for free on Sky News channel 501, on Freeview 233, on Sky Showcase channel 106, and across Sky News' digital channels.
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