Donald Trump sworn in as 45th US president aljazeera.com

Donald Trump becomes 45th president as protests turn violent in Washington DC. Donald Trump has been officially sworn in as the 45th president of the United States.

The inauguration took place outside US Capitol in Washington, DC on Friday, ushering in a new political era.

"Together we will determine the course of America and the world for many, many years to come," Trump said in his inaugural speech.

"We will face challenges, we will confront hardships, but we will get the job done."

He added: "For too long a small group in our nations capital has reaped the rewards of government. Washington flourished, but the people did not share in its wealth."

He also pledged to unite the world against "radical Islam".

After finishing his inaugural speech, Barack Obama, the outgoing president, tapped his shoulder and said, "Good job, good job".