US President Donald Trump is expected to underline the need to confront extremism in Islam when he makes a speech in Saudi Arabia later today. <br/><br/>His address, to leaders of 50 Muslim-majority countries, will come on the second day of his first presidential trip abroad. It is expected he will attempt to strike a collaborative tone in attempts to bolster support for the US fight against Islamic State militants.<br/>'<br/>White House officials said they consider Trump's visit, and his keynote address, a counterweight to President Barack Obama's debut speech to the Muslim world in 2009 in Cairo. <br/><br/>Yesterday, US signed trade deals worth more than 350 billion dollar with Saudi Arabia. This included the largest arms deal ever made in US history, which Secretary of State Rex Tillerson said was aimed at countering the malign influence of Iran, Saudi Arabia's regional rival.