Malcolm Turnbull was sworn in Tuesday as Australia's new prime minister, becoming the country's fourth leader in just over two years.
Turnbull Sworn in as New Australia PM

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Malcolm Turnbull makes an address at Parliament after he was sworn in as prime minister in Canberra, Australia, Sept. 15, 2015.

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Malcolm Turnbull is sworn in as Australia's 29th prime minister by Australia's Governor-General Peter Cosgrove (right) at Government House in Canberra, Sept. 15, 2015.

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Malcolm Turnbull (3rd from right) poses with members of his family after being sworn in as Australia's 29th prime minister at Government House in Canberra, Sept. 15, 2015.

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Malcolm Turnbull (bottom right) makes an address at Parliament after he was sworn in as prime minister in Canberra, Sept. 15, 2015.