In the US, the Trump administration is undergoing its first major cabinet shake-up, with national security advisor Mike Waltz ousted from his post. Waltz has faced calls to resign after he accidentally invited a journalist to a group chat that discussed sensitive military operations on the private messaging app Signal. But President Trump says he will nominate Waltz as US ambassador to the United Nations, with Secretary of State Marco Rubio taking on the role of interim national security

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