Sitting behind the Resolute desk in the Oval Office President Donald Trump wasted no time setting out to demolish Barack Obama's legacy,.

With a deliberate, and probably very satisfying, swipe of his black and gold pen, the new president fired the first shot in his assault on the Affordable Care Act, his predecessor's signature healthcare policy also known as Obamacare. Putting his pen away afterwards, Mr Trump said firmly; "OK, that's it!"

It won't just be Obamacare. From climate change and energy production, to how America trades with its partners and treats it allies, Mr Trump signaled there would be a clean breach with the Obama years.

On questions of how to deal with Russia, whether to close Guantanamo Bay, policing and community relations, he indicated America would be making a 180-degree turn in the coming months. Officials spoke of "erasing" Mr Obama's imprint on the country from the history books.