Republican presidential front-runner Donald Trump said on Tuesday the United States should use waterboarding and other harsh interrogation techniques when questioning terror suspects, and renewed his call for tougher U.S. border security after the attacks in Brussels.br br The billionaire businessman said authorities "should be able to do whatever they have to do" to gain information in an effort to thwart future attacks.br br "Waterboarding would be fine. If they can expand the laws, I would do a lot more than waterboarding," Trump said on NBC's "Today" program, adding he believed torture could produce useful leads. "You have to get the information from these people.