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Hello, I'm Paul Henley.
Welcome to NewsHour from the BBC World Service.
We're live from London.
Since the start of the Iran war two and a half weeks ago, disagreement within the US Republican Party has been fairly muted.
Today, a significant crack emerged.
The head of the US National Counterterrorism Center, who is a long-time supporter of Donald Trump,
has announced his resignation, saying he couldn't in good conscience back the administration's war.
In a letter to the President, Joe Kent said Iran posed no immediate threat to the US and it was clear Mr Trump had gone to war under pressure from Israel
and its powerful American lobby.
Mr Kent, who is a former Green Beret combat veteran, urged the President to change course.
Otherwise, he said, the US would slip further towards decline and chaos.
Donald Trump spoke about Mr Kent to reporters today.
It's a good thing that he's out because he said that Iran was not a threat.
Iran was a threat.