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Donald Trump.
Reuters/Joel Page
US sovereign debt is one of the safest assets in finance.
But that safety was called into question this month by US presidential candidate Donald Trump, who suggested that the US could negotiate with creditors and wouldn't need to pay the whole $13 trillion back.
The US Treasury, for the first time since the 1970s, has published more detailed data on who owns that debt, giving a breakdown of Saudi Arabia's holding.
The report gave details on specific countries that were previously lumped together in groups such as "oil exporting nations" and "Caribbean banking centers," according to the Associated Press.
The Treasury showed that Saudi Arabia held $116.8 billion of US debt in March, down 2.5% from February.
Here's how the rest of the world's US debt holders measure up, as of March:
17. South Korea — $84.1 billion (£57.99 billion).
REUTERS/Kim Hong-Ji
16. Russia — $86 billion (£59.3 billion).
David Burdeny
15. Germany — $90.1 billion (£62.14 billion).
REUTERS/Fabrizio Bensch
14. Singapore — $112.7 billion (£77.74 billion).
People look out from the observation tower of the Marina Bay Sands amongst public and private residential apartment buildings in Singapore, on February 22, 2016.
Edgar Su/Reuters
13. Saudi Arabia — $116.8 billion (£80.58 billion).
Widows daubed in colours dance as they take part in the Holi celebrations organised by non-governmental organisation Sulabh International at a temple at Vrindavan, in the northern state of Uttar Pradesh, India, March 21, 2016.
Reuters/Anindito Mukherjee
7. United Kingdom — $227.6 billion (£157.03 billion).
US President Barack Obama takes a question as he speaks to a town hall meeting at Lindley Hall, the Royal Horticultural Society, in London, Saturday, April 23, 2016. Obama held the town hall-style event in London taking questions on diverse subjects from the predominantly young people in the audience.
AP Photo / Matt Dunham
6. Switzerland — $230 billion (£158.68 billion).
An activist from the "compact" group demonstrates against the new planned tax agreement with Switzerland in front of the Brandenburg gate in Berlin, August 10, 2011.
REUTERS/Pawel Kopczynski
5. Brazil — $246.4 billion (£169.97 billion).
Demonstrators attend a protest against Brazil's President Dilma Rousseff, part of nationwide protests calling for her impeachment, near the Rio Negro river in Manaus in Amazonas state, Brazil, March 13, 2016.
REUTERS/Bruno Kelly