The phrase "broad mandate" refers to giving someone or an organization the authority or power to carry out a wide range of tasks or responsibilities. Full definition
As regular readers will remember, the working group was originally given a very broad mandate back in 2010. (slaw.ca)
«If you're operating a business, you have no idea what's going to come down on you from the continuum of agencies operating under broad mandate,» he said. (govexec.com)
Same for junk bonds among broad mandate bond managers. (alephblog.com)