One of the remaining candidates will be eliminated in the next round of voting on Monday evening.
READ MORE: Sunak and Truss Cause Chaos as Sky Leaders Debate CANCELLED
Tory MPs vote between 5:00 PM and 7:00 PM, with the results announced at 8:00 PM.
The vote leaves four remaining contenders, with the last-place candidate being dropped from the race.
Prior to the next vote, Express.co.uk held a poll from Friday 15 July 9am to Monday 18 July 3pm asking: “Who do you want to win the Tory leadership contest?”
As many as 17,579 people cast their votes and hundreds of readers shared their thoughts in the comments below the accompanying article.
Overall, Ms. Mordaunt was the most popular candidate with 40 percent (6,955 people) of the votes cast.
This was followed by Secretary of State Ms. Truss, with 33 percent (5729 people) of readers supporting her.
In addition, some 12 percent (2106 people) supported Ms. Badenoch.
Both former Chancellor Sunak and Tugendhat received six percent (1,038 votes each) of the vote.
Another four percent (713 people) answered “other”.
Username Silverbells said: “I would vote for Liz, her stamina to make deals for the UK speaks for itself!
“If it’s not Liz, then Penny, I think her quick mind and steely backbone would be a great asset against the disgusting scum in the House of Commons!”
Readers also supported Ms. Mordaunt with one reader, username Blackbrooke writing, “Mordaunt did NOT betray Boris. If you’re looking for an ideal PM, she’s it.”
And username ScotsLass, said, “I think Penny. As long as it’s not Sunak.”
Others argued against Mr. Sunak using the username Cookyz who wrote, “Everyone except Sunak!”
Username JohnBro1 said, “Rishi is the last person this country needs as prime minister and if they select him I think the Tories will lose a lot more votes in the future.”
In addition, readers questioned the experience of Ms. Badenock and Mr. Tugendhat.
Username Alison2015 said “I like the sound of Kemi but feel like she lacks experience.”
While username Robert Ward wrote, “Tugendhat not really a known amount.”
Candidates would face another TV debate on Tuesday evening, hosted by Sky News’ Kay Burley.
However, the station was forced to cancel the broadcast after Mr Sunak and Ms Truss announced they would not participate.