UK Prime Minister David Cameron is on a two-day visit to the US. Both Cameron and President Barack Obama have vowed to defeat terrorism in the wake of recent Paris terror attacks.
During Cameron's visit, the global economy is also expected to be a discussion topic. The focus will also be on national security, which includes the possible threat of cyber attacks.
At the Oval Office on Friday, there will also be discussions on the sanctions against Russia, Ebola and attacks by Boko Haram Islamist militants in Nigeria.
Cameron said the police shooting in Belgium showed that Europe faces a huge threat from Islamic extremism.