New Hampshire residents' assessment of Donald Trump's performance as President is unchanged since April. Just over half of residents continue to say the Mueller investigation is a serious matter that should be fully investigated and few would support Trump firing Robert Mueller, though support for such an action among Republicans has increased.
UNH Survey Center
Survey Center, UNH, "Trump Approval Unchanged in NH; High Awareness of Mueller Investigation 8/22/18" (2018). All UNH Survey Center Polls. 3.