There's a common phrase "one lump sum." that's probably what it's supposed to say.
It's used mainly in money.
A common example is with the lottery. If you win $100 million, they give you two ways of receiving it.
Either you could receive a monthly payment for the next 20 years, which adds up to $100mil. ($416,666.66 a month for 240 months)
Or, you could receive a major portion of it in "one lump sum."
In that case, they'll take all of the money you should be getting over the course of 240 months (20 years), minus the interest that would have accrued.
They "lump it" into one "sum" of money.
A lump is a something compacted together.
When you are mixing a batter, and some of the flour hasn't dissolved properly and clumps up together. That's a lump.
So when used in money, it means the money is being collected together into one compact amount, or "sum" of money.
From money, this term is then borrowed to other topics.
So in the context of a political discussion they would use it to refer to nations.
Instead of discussing various nations individually, you could discuss them in "one lump sum."
While I can't currently access the video to check if that's the term being used, I imagine it's so since that's a common English idiom which fits the context.