DONALD Trump is set to become America's 45th president. 

His inauguration begins at 5pm (GMT). 

President Barack Obama and First Lady Michelle Obama greeted Mr Trump and his wife Melania upon their arrival at the ceremony.

Hundreds of thousands of supporters and protesters are expected in Washington DC for the event.

Thousands of police have been deployed and many kilometres of crowd barriers set up as part of a vast security operation ahead of the inauguration.