Israel’s role in supplying information that helped track the militant highlights the sensitivity of some disclosures in the texts and raises questions about the Trump administration’s contention that no classified information was shared on the Signal chat, a publicly available nongovernmental app.

The Biden administration sought last year to develop options to strike senior Houthi military and political leaders and approached the Israelis and Saudis for help, according to people familiar with the classified planning. It didn’t decide to carry out those strikes, but the work on those options appear to have given the Trump administration a start in developing targets for their March 15 strike on Houthis militants in Yemen.