Donald Trump refers to 'a little strain' in Saudi Arabia relationship

US president Donald Trump will use the nation that is home to Islam's holiest site as a backdrop to call for unity across the Muslim world in the fight against terrorism.

Mr Trump's speech on today, the centrepiece of his two-day visit to Saudi Arabia, will address the leaders of 50 Muslim-majority countries to cast the challenge of extremism as a "battle between good and evil" and urge Arab leaders to "drive out the terrorists from your places of worship," according to a draft of the speech.