The Prime Minister intervened after a series of vicious leaks targeting Chancellor Philip Hammond.
She urged ministers to stop bickering and focus on their job of delivering for the public.
The attempt to instil Cabinet discipline comes after a series of newspaper headlines about Mr Hammond's comments at last week's Cabinet.Related articles
According to newspaper reports, Mr Hammond was slapped down by the PM for saying that women could "even" become train drivers – a claim he denied.
And a separate report said that he had told colleagues that public sector workers were overpaid compared to those in the private sector.
The row cultimated in a Daily Telegraph front page story quoting an unnamed minister accusing the Chancellor of trying to "f*** up" Brexit.
GETTYTheresa May has intervened following a series of Cabinet leaks
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Saudi Arabia's King Salman bin Abdulaziz al-Saud (R) meeting with British Prime Minister Theresa May in the capital Riyadh, Saudi Arabia, 05 April 2017. May is visiting Saudi Arabia as part of her Middle East trip to boost diplomatic ties in the region
Cabinet must be able to hold