Casablanca — IN language rarely seen among nations, some of Donald Trump's closest allies have attacked an International Monetary Fund (IMF) loan to Mauritania, accusing the country of torture, theft and slavery.
Six of Donald Trump's most senior Republicans in Congress have taken the unusual step of going over the White House and cabinet to condemn one of Washington's closest allies in Africa.
The congressmen have written to Christine Lagarde, head of the IMF, and asked her to end funding to the Islamic Republic of Mauritania in West Africa.
Gone is the diplomatic waffle of politics, replaced by a condemnation of President Mohamed Aziz that goes beyond even the tweets of Mr Trump, accusing Mauritania and its government of theft, slavery, corruption and a "heinous human rights record".
The letter dated 5 March was signed by a clutch of names you might not know, but they are men who backed Trump early in his rise, and all are crucial to getting his bills through congress.
- Mark Meadows of North Carolina is one of the president's closest friends and chairs the Freedom Caucus, a 40-strong groups of politicians who have the numbers to make or break legislation.
- Thomas Garrett from Virginia is a former army officer and a rising star in the Republican Party.
- Jeff Duncan among the strongest supporters of Mr Trump in Congress and sits on the Foreign Affairs Committee, along with Lee Zeldin and Scott Perry, both of whom signed the letter.
- Gus Bilirakis of Florida has a name for calling out bad leaders, but not in this kind of language.
True, Mr Aziz runs one of the most oppressive governments anywhere, but the US befriends any number of nasties including Djibouti, China and Saudi Arabia.
And Congress is careful to leave foreign policy to the executive, knowing how easily a loose word in the house can damage trade, defence and the so-called "War on terror."
But in what has been dubbed the "Mauritania Memo", the House appears to have put Mr Trump on notice that in plans to take a more aggressive role.
Mauritania covers more than a million square kilometres -- mostly desert -- and tops the list as having more slaves per capita than any country in the world. But its government is squarely against groups like al Qaeda, al Shabaab and Boko Harum, and allows US troops free reign in tracking them down.
The IMF recently approved a $163m line of credit that Christine Lagarde tweeted would improve living standards for Mauritanians who suffer a level of poverty that's harsh even by African standards.
But the Congressional letter claims this money will "line the pockets" of president Aziz whom it accuses of "rigged contracts" for all types of business along with bribes and corruption.
"Up to 20% of Mauritania's population is estimated to be enslaved, the highest rate worldwide," the letter says.
Aziz has "denied entry to human rights groups, employed torture and detained opposition leaders without cause."
And it closes with a call for action. "If President Aziz continues to foster an environment unrecognisable to international norms," then the IMF boss should end funding to ensure the fund does not "become complicit in the Aziz regime".
In Paris where thousands of Mauritanians have fled to exile, protests are common outside the country's embassy. And always there is Thomas N'diaye who has long called on the French government to clamp down on its former colony.
"I believe this letter can be game changer in our struggle for freedom," he said.
"We know the US military needs Mauritania for its counter-terror work, but does that give President Aziz the right to visit even worse terrors on his own people?"
Congress, he said, had discovered Mauritania, "the way it suddenly took on apartheid in the 1980s after decades of collusion with the minority white government. We are the slave capital of the world and it is true that our leaders enrich themselves on loans and foreign aid meant to help the poor.
"The African Union does nothing about thousands of old-style slaves in my country, France colludes with the regime and US leaders have simply seen us as a place that cooperates with the war on extremists. This memo from Congress could change that."
Perhaps Mr N'diaye and his exiles are too optimistic. Maybe the Mauritania Memo is a one-off from senior Republicans who wanted, as politicians do, to get their names in the press and in front of the president.
If more letters follow, perhaps on Chinese tariffs, Russian spies, the threat to take land in South Africa without compensation, then maybe we can say there's a new mood for action, a Congress ready to force the hand of the State Department, the White House, even the IMF.
That it started with an obscure place like Mauritania might have method: if the attack went wrong, the fallout would be around a country most Americans couldn't find on the map.
For the people of Mauritania, so rarely in the news, the letter is a boost in their long fight for democracy, freedom and an end to slavery.
And Christine Lagarde may have to rethink her loan.