The transition between the Barack Obama and Donald Trump presidencies is creating a vacuum that is increasing the threat of genocide in trouble spots, a top official at the U.S. Holocaust Memorial Museum is warning.

Cameron Hudson, director of the museum’s Simon-Skjodt Center for the Prevention of Genocide, said that leadership transitions in Washington and at the United Nations were distracting the institutions from genocides or potential genocides in Syria, Burma, Iraq and South Sudan.

“We’re facing a moment in time, with the U.S. and U.N. in transition — we’re faced with this moment where there could be a leadership vacuum,” Hudson said.

The intensified attacks by the Assad regime and its allies on the rebel stronghold of Aleppo in Syria are just the latest example of the mass atrocities detailed in a museum statement.

Others include the U.S. government determination in March that the Islamic State was carrying out genocide against religious minorities in Iraq; the intensified Burmese military campaign against the Rohingya, the country’s Muslim minority; and the slaughter of civilians in South Sudan caught among the military ethnic militias.

The Dec. 9 statement called on the United States and the international community to recognize “not only these very real threats, but also the dramatic side effects of our failure to address them.”

Samantha Power, the U.S. envoy to the United Nations, delivered an impassioned speech last week singling out envoys from Russia, Iran and Syria for the Aleppo atrocities, asking them,  “Is there literally nothing that can shame you?” But the outgoing Obama administration has not offered concrete proposals to end the carnage.

Hudson said the U.S. has the means to do so at its disposal. Three years ago, Obama created an Atrocities Prevention Board that brings together officials from an array of agencies to create a coordinated prevention strategy.

Pro-government forces in Aleppo on Dec.19 photo/afp-getty images-george ourfalian

It’s not clear what the fate of the board will be under a Trump administration, Hudson said while emphasizing that the museum’s concerns are not about the incoming president’s policies but about the coincidence of four regions enduring genocides or similar crimes.

“We often talk about genocide being a very rare event, but we’re seeing a rare moment now where the Islamic State is carrying out genocide against religious and ethnic minorities in Iraq and a high and mounting threat of genocide in South Sudan and Burma — we’ve seen recently both situations take a turn for the worst. And everything going on in Aleppo, in Syria, is a crime against humanity,” he said.

Jewish groups have responded in recent days to the crisis in Aleppo, where Syrian troops, backed by Russian and Iranian allies, are clearing out the last pockets of resistance to the regime of President Bashar Assad. There have been reports of summary killings of civilians who had been promised safe passage.

The Jewish Council for Public Affairs, the umbrella body for the community’s public policy groups, said “Never again means never again for everybody,” referring to the phrase Jews invoke to ensure that the Holocaust is never repeated.

Other Jewish groups also alluded to world inaction during the Holocaust.

“We know all too well from history the tragic consequences of governments that failed to find the will to act in the face of such unspeakable crimes against humanity,” said David Harris, the American Jewish Committee CEO.

“The complexity of the conflict cannot be an excuse for continued inaction in the face of increasing atrocity,” Jonathan Greenblatt, the Anti-Defamation League’s CEO, said in a blog post this week.

A number of Jewish groups will hold rallies worldwide to protest the atrocities.

Hudson wondered if people were not growing inured to the tragedy, seeing it unfold in real time on TV and in social media postings from the conflict zones.

“It used to be said, ‘Had we done more, more would have been done.’ We can no longer make that argument now — we can’t know any more than we already know of what’s going on in Aleppo,” he said. “But knowing has not translated into a response.”

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Ron Kampeas is the D.C. bureau chief at the Jewish Telegraphic Agency.