Waltz’s fate was sealed by his inclusion of a journalist on a sensitive Signal group chat in March. But he had been clashing with other top officials since early in the administration, including over whether to pursue military action against Iran, senior officials and Trump advisers said Friday.

It wasn’t just Signalgate that led to Mike Waltz being canned as President Donald Trump‘s national security adviser. Before that scandal, Waltz had already angered Trump by going behind his back to talk with Israeli Prime Minister Benjamin Netanyahu about waging war on Iran,

Mike Waltz discussed the possibility of striking Iran with Israeli Prime Minister Benjamin Netanyahu. The move upset US President Donald Trump, reports The Washington Post. A few days ago, Trump dismissed Waltz from his position as National Security Advisor and appointed him US Ambassador to the UN.

Mike Waltz, the national security adviser for President Donald Trump, is seen in photos using Signal during a Cabinet meeting on April 30.

Waltz's deputy, Alex Wong, who was also ousted this week, reportedly remains at the National Security Council.

Donald Trump’s decision to fire National Security Adviser Mike Waltz could pave the way for a sweeping "widescale purge" of his White House staff. According to insiders, the potential mass firings may hit as soon as late next week,