Live updates: Trump will 'look into' use of Signal app as he defends security adviser Waltz

Here's a quick recap of what some of the key players in he leaked Signal chat saga have said about the topic so far:

Jeffrey Goldberg: The Atlantic magazine journalist reported on Monday that top Trump aides had accidentally added him to a chat on the Signal app, in which the officials discussed upcoming US plans to bomb Yemen and congratulated each other after Washington launched a series of strikes against the Houthi rebel group. Goldberg reports that the chat included classified information, including the name of a CIA agent, the types of weapons the US planned to use, and specific targets.

Donald Trump: President Trump has defended his National Security Adviser, Mike Waltz, who reportedly added Goldberg to the chat, but adding that he "probably" won't be using Signal again. He also argued that no classified information was shared in the chat.

Mike Waltz: Trump's national security adviser, whom Goldberg says was in the chat, speaking alongside Trump earlier, said it would be best for all parties to be in the room together for sensitive government matters. He also attacked Goldberg, saying he had "never met" him, and "never communicated" with him.

Pete Hegseth: The US defence secretary, whom Goldberg says was in the chat, told reporters "nobody was texting war plans". He also attacked Goldberg as "a deceitful and highly discredited so-called journalist who's made a profession of peddling hoaxes time and time again".

John Ratcliff: The CIA director, whom Goldberg says was in the chat, testified to Congress on Tuesday, saying that using Signal is "permissible" for US spies and denied accusations from Democrats that Trump's officials had made a "huge mistake".

Republican Senator Roger Wicker: The chairman of the Senate Armed Services Committee said his committee will investigate the group chat leak, saying the members would need full access to the group chat's transcript. "I expect we'll have the full cooperation of the administration," he said.

Republican Senator Ted Cruz: The Texas lawmaker told BBC News that "it was obviously a mistake" for Goldberg to have been included in the chat. But he applauded the decision to attack the Houthis, saying: "What the entire text thread is about is President Trump directed his national security team take out the terrorists and open up the shipping lanes. That's terrific."

Democratic Senator Richard Blumenthal: The member of the Senate Armed Services Committee is among scores of outraged Democrats calling for Trump aides to be fired for accidentally leaking US military plans. He called the leak "appalling and astonishing", and told the BBC that some Republicans are privately criticising the White House.

Democratic Senator Chuck Schumer: The highest-ranking Democrat in the Senate told reporters that the US defence secretary had "showed a colossal lack of judgement" and may have even put US troops in danger. He called for a bipartisan investigation and said that Republicans "must not shrug their shoulders and call this incident 'one of those learning moments'".