In the chat, the participants discussed plans to strike Houthi targets in Yemen, part of the U.S.'s longstanding involvement in a bloody civil war that has caused hundreds of thousands of civilian deaths.

U.S. senators lined up to question President Donald Trump's top intelligence officials on Tuesday over their discussion of highly sensitive war plans on a commercial messaging chat that also included a journalist,

The Trump administration sought on Tuesday to contain the fallout after a magazine journalist disclosed he had been inadvertently included in a secret group discussion of highly sensitive war plans, while Democrats called on top officials to resign over the security incident.