The Newsnight presenter ripped into the shadow home secretary after she reached for a copy of her party manifesto and called it “the biggest star that we have in our show”.
She then could not contain her laughter as the host proceeded to grill her about working age benefits being “uprated” and whether it was costed or not.
Ms Thornberry said: “The fact is this [reaches for manifesto] is the biggest star that we have in our show, which is a series of ideas and an alternative vision for Britain.”
Davis replied: “If you want to wave the manifesto…”
Evan Davis ripped into Emily Thornberry over Labour's manifesto
I’m laughing because I know you’re going to start asking me numbers – I know you are, it’s late
But he was cut off by the politician snorting and laughing.
He continued: “The manifesto says it is very carefully costed – it’s not that funny, it says that it is very carefully costed.”
Ms Thornberry apologised and suggested it was too “late” to be grilled on her numbers.
“Sorry, I’m laughing because I know you’re going to start asking me numbers – I know you are, it’s late, it’s late,” she said.
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Jeremy Corbyn during a visit to Hackney Marshes Football Pitches, to highlight Labour's manifesto commitment to ensure 5% of the Premier League's television rights income is diverted to the grassroots game, during a General Election campaign
Emily Thornberry said the her party manifesto was “the biggest star that we have in our show”
Davis insisted he was not trying to catch to politician out on her numbers but said some areas of Labour’s manifesto was “simply not costed”.
He said: “Believe me, I’m not going to… try to test you on your numbers, I’m not. However, there are some policy areas where it’s simply not costed.
“Are benefits going to be uprated or not because working age benefits, on Monday, Jeremy Corbyn said they would be but there’s not cost in there for that.
“That’s not a costed manifesto, is it?”
The politician seemed to swerve the question and said the Labour party would be reviewing the benefits system.
She said: “If we have the great honour of taking over as the next government we will need to go into the Department of Work and Pensions and look at, I’m afraid, the chaos that is universal credit.
“And we need to look again at how well it is working, how fair it is and how the cuts that will be affecting real people’s lives and we’ve set aside £2billion a year in order to be able to look again at universal credit and sort it out.”