U.S. President Donald Trump vowed on Thursday to crack down on leaks that prompted Manchester police to withhold information from the United States about the investigation into this week’s bombing.

Mr. Trump, who said there is “no relationship we cherish more” than the one with the U.K., declared the leaks “deeply troubling” and said he was asking the Justice Department to lead an investigation into the matter. “These leaks have been going on for a long time and my administration will get to the bottom of this,” he said in a written statement. “The leaks of sensitive information pose a grave threat to our national security.”