Last month’s shooting at the Chabad of Poway, a California synagogue in a suburb about 20 miles north of San Diego, killed one woman and injured three others. Before picking up his assault-style rifle, the 19-year-old male now being held for that attack posted an anti-Semitic, white supremacist screed to the internet forum 8chan. In the post, he also claimed responsibility for a mosque fire nearby and said he was inspired by the shooter who murdered 50 people in two Christchurch, New Zealand mosques in March.

This horrific connection, drawn by an American teen to a massacre half a world away, reminds us once again that white supremacy sees so many of us—in different but interlinked ways—as threats to be obliterated in order to preserve power. The foot soldiers in this battle will be white men who have been told in a thousand ways how and why they should be on top; men who now feel their power ebbing and are desperate to reassert it, through violence if necessary.

In moments like this, political leaders and pundits offer platitudes and “thoughts and prayers,” but also leap to place blame. For Ted Cruz, Meghan McCain, and their fellow travelers, it was yet another opportunity to point the finger at their favorite scapegoat, Ilhan Omar, a naturalized United States citizen and former refugee from Somalia, who now represents Minnesota’s 5th District in the House of Representatives. It is nauseating that Cruz and McCain (neither of whom is Jewish) targeted a Muslim woman when the Poway shooter, himself, targeted Muslims, but theirs is a divide-and-conquer tactic with a long, nasty history.

Jews (like me), of course, are no strangers to being scapegoated for a country’s ills, and even blamed for the violence visited upon them. But that is exactly why this is a moment for solidarity—a moment to proclaim unity with the victims of violence and the enemies of white supremacy the world over. The rise of anti-Semitic violence once again is a reminder that the boundaries of whiteness can shift, and that groups that had felt relatively safe can find themselves quickly on the wrong side of those borders.

The rise of ethnonationalist political leaders and racist violence should have focused attention on the threat of the far right, but instead, the loudest voices warn of an anti-Semitism problem on the left. In the U.S., that focus has come from the president, but it has been enabled by the supposed “resistance” to Trump: the Democratic Party leadership. (For instance, right after Trump targeted Omar, House Speaker Nancy Pelosi piously tweeted about her discussion of anti-Semitism with a splinter group of U.K. politicians.)