Al Carns, who quit the government as armed forces minister this week in a row over defence spending, has just been speaking on the show.

Laura Kuenssberg asks Carns, who is understood to be interested in running for the Labour leadership in a potential future contest:

"I've been told that the prime minister has got a bank account and also a company ready to fight a leadership contest, so he's all set up and ready to go. Have you done that?"

Carns does not directly answer the question, but says Labour needs an open contest of ideas about the country's direction.

"What I would like to see, whatever happens in the future, is a really clear and concise policy debate about the big ideas and the courage to take those big ideas forward for the next three years," Carns says.

Lisa Nandy says it's clear that urgent action is needed on social media safety for young people, with the prime minister due to make an announcement tomorrow.

"We know that there hasn't been enough in the way of regulation, and we know that there are wider measures that are needed as well," the culture secretary tells Laura Kuenssberg.

The minister says she doesn't want to "pre-empt the prime minister's announcement", but says the "vast majority" of people who responded during consultations were in support of a social media ban for under-16s.

"That came through not just from parents and campaigners, it did also come through from many young people themselves, who are feeling that they're being pulled into something quite toxic at a very young age."

Nandy says the government cannot stand by when young people clearly need help.

"The tech companies have had more than enough time to get their own house in order, and to be able to create products that keep children safe online.

"If they're not prepared to do it, they lose the right to market their products towards children," she says.

This week's Sunday with Laura Kuenssberg features Culture Secretary Lisa Nandy and Shadow defence secretary James Cartlidge in the hot seat, along with Liberal Democrat leader Ed Davey.

It comes after another dramatic week in Downing Street, which saw Defence Secretary John Healey and Armed Forces Minister Al Carns resign from the government, both criticising the government's plans for defence.

Carns, who told the prime minister that the government's defence investment plan is "neither transformative enough nor sufficiently funded", is also set to appear on today's panel.

Meanwhile, Nandy is expected to face questions from Kuenssberg as the prime minister prepares to announce plans for a crackdown on children's access to social media.

Some media reports have suggested under-16s could be banned from accessing some social media platforms under the plans, while safer ones would face restrictions.

We won't be bringing you regular text updates from today's programme, but you can watch live at the top of the page from 09:00.