"The admiral who led the raid that killed al Qaeda leader Osama bin Laden cautioned President Trump May 20 about pardoning members of the military accused or convicted of war crimes.
"'One of the things the president always has to be cautious of is, within the military we have this thing called undue influence,' now-retired four-star Navy Adm. William McRaven said on CBS This Morning
"'So, if there is an ongoing investigation, as a senior officer you're not authorized, you're not allowed, to imply how you think the outcome of that case ought to be. That's called unduly influencing the man or woman in charge of that investigation. So, the president has to be careful about signaling his intent [to pardon].'"