Donald Trump has confirmed he's standing 'strongly' behind Pete Hegseth after reports claim he leaked more military plans.

Hegseth's wife, lawyer and brother were included on a Signal group chat, where he shared detailed plans about an operation against Houthi rebels in Yemen.

This comes one month after a journalist released messages between top US officials after accidentally being added to their group chat.

US correspondent Mitch McCann says Donald Trump has 'dug his heels in' and he's reluctant to let go of Hegseth as US Secretary of Defence. 

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