As it pulls up stakes and makes an exit from Hungary, George Soros’ philanthropic organization called the latest accusations from that country’s government about the pullout “nonsense.”

Without providing specifics, Hungary’s Foreign Affairs and Trade Minister Peter Szijjarto told CNBC Thursday that Soros’ Open Societies Foundation (OSF) left the country because it didn’t want to reveal its sources of funding.

In response to Szijjarto’s accusation, OSF Chief Communications Officer Laura Silber told CNBC in an email, “That is nonsense.” She said the foundation’s departure took place “because, in the words of our President Patrick Gaspard: ‘The government of Hungary has denigrated and misrepresented our work and repressed civil society for the sake of political gain, using tactics unprecedented in the history of the European Union.'”

The announced departure of Soros’ non-governmental organization (NGO) from Hungary in May made headlines amid an outcry from advocacy groups that the country’s government is cracking down on civil liberties. Its staff have been relocated to Berlin.

OSF representatives said that they were no longer able to keep their staff safe under the government of Prime Minister Viktor Orban, and that they were a target of government surveillance.

But Szijjarto has other ideas about the group, arguing that organizations like the OSF, which advocates for migrants’ rights and resettlement, threaten national security.

“I have my own thought why they left,” the minister said while at the annual Organization for Economic Cooperation and Development (OECD) forum in Paris. “They left because they didn’t want to publish whom they are financed by … I’m pretty sure that they have things to hide.”

Still, the minister lacked specifics, admitting, “I don’t know why they’re hiding their financial resources, but the fact is that they want to hide them.” He added that only a minority of the country’s NGOs have complained about strict new laws mandating the disclosure of funding sources, saying that this was telling in itself.

Silber responded by pointing out that the organizations the OSF funds in Hungary are publicly available on the foundation’s website, and that the OSF’s funding is provided by George Soros.

The current government of Hungary has long been in open conflict with Hungarian-born Soros, who has donated billions of dollars to notably liberal causes. Soros, a Jewish survivor of the Nazi occupation, is a staunch advocate of immigrant rights, which has put him directly at odds with Hungary’s right-wing government.

“Hungary has national security interests,” Szijjarto said. “One of them is to be able to protect the border, to be able to control who is entering the territory of the country, and to stop the flow of illegal migration.”

The country of nearly 10 million has quietly closed its doors to nearly all asylum seekers, and announced in February it would allow in only two asylum seekers per day. Human rights activists claim this violates international laws.

Unapologetic in its anti-migration stance, Hungary’s current administration is led by the firebrand Orban, who soundly won reelection in April to become the country’s third-longest serving prime minister. Orban ran on a pledge to protect the country’s borders and beef up security, while promising a “Stop Soros” bill that would heavily tax and restrict foreign-funded NGOs in the country, like the ones belonging to Soros.

Amnesty International has called the bill a “muzzle” on NGOs working with migrants and EU officials have expressed concern at what they view as suppression of civil society.

Last summer, Soros lauded the “courageous way Hungarians have resisted the deception and corruption of the mafia state Orban has established.” Orban called it a “declaration of war,” accusing Soros of leading a mafia-like network.

Orban critics label the government as xenophobic, and often attribute its anti-Soros campaign to anti-Semitism or an attempt to distract the public from political corruption. Szijjarto has denied this, stressing the need for outsiders to respect Hungary’s security needs.

Szijjarto pointed to a diametric difference in values. “We have an open debate, an open conflict with George Soros, because we have a totally different vision about the future of Europe,” he said.

“We have a totally different vision about Europe sticking to its heritage and tradition, and we have a totally, totally, totally different vision on how Europe should deal with migration.”

He went on to illustrate Soros’ “open will to throw out the government during the elections,” claiming that its his? continued outcries are a result of frustration over seeing Orban win again, and that “organizations who carry out activities harming our national security interests must consider the consequences.”

The OSF, founded in 1993, has branches in 37 countries and an endowment of $19.5 billion, making it one of the largest private philanthropic budgets in the world. Its work focuses on funding civil society and social justice groups and promoting liberal democratic values, which it says have increasingly come under fire from populist governments.

Orban began his latest term in office by announcing that the era of “liberal democracy” was over.