His political inexperience propelled him to the White House: Donald Trump sold himself to America as an outsider ready to take a sledge hammer to the status quo.

But, in his first 100 days, Mr Trump has found that not even a man of his flame-throwing credentials has been able to start the fires he so wanted.

"After listening for 10 minutes, I realised it’s not so easy,” said Mr Trump on April 12, describing his conversation with President Xi Jinping of China, and his attempts to get the Chinese to rein in North Korea.

"Nobody knew health care could be so complicated," he said on February 27, exasperated at the failure to replace Obamacare.

So what are the key issues Mr Trump has faced?