Antisemitism debate exposes new fault lines in US politics

The fallout from comments by Ilhan Omar spans identity politics, party politics, geopolitics and a generational divide.

An Israeli prime minister who has embraced Donald Trump and taken rightwing populism from his playbook. And a group of fiery young Democrats unafraid to question their elders or challenge the status quo. Put together, the elements were bound to be explosive.

Democrats were expected to offer a resolution condemning antisemitism on the floor of the US House of Representatives on Thursday following the latest provocative comments by Ilhan Omar of Minnesota, who...