Cameron says he's asking defense chiefs to consider boosting quick-response counterterrorist capabilities such as "spy planes, drones and special forces."
Yesterday, Cameron is visiting an air force base that is home to Britain's fleet of Reaper drones, which have flown surveillance missions over Iraq and Syria as part of the U.S.-led campaign against IS. British warplanes have struck targets in Iraq, and Cameron has suggested the mission could be expanded to Syria.
Britain's military has faced a budget squeeze in recent years as Cameron's government cut public spending. But Treasury chief George Osborne has committed to spending 2 percent of national income on defense.