President Donald Trump said on Friday that the United States knows who the Islamic State group's new leader is, as the United States vowed to keep "unrelenting" pressure on the extremists. "ISIS has a new leader. We know exactly who he is!" Trump tweeted, less than a week after a US-led commando raid killed the group's leader Abu Bakr al-Baghdadi. Islamic State on Thursday confirmed Baghdadi's death and named his ...