Pressure from Republicans is already resulting in changes at the Fed.
As prices have risen, so have the share of Americans reporting they don't have enough to eat.
The hacker remotely accessed some Treasury workstations and unclassified documents.
The Fed adjusted its policies well ahead of Trump's inauguration eight years ago.
Powell's remarks prompted traders to pare back expectations for a December rate cut.
He also said removal or demotion of any Fed board leaders, including himself, is “not permitted under the law.”
Researchers also found a political divide among respondents.
The rate cut was a key victory for the Fed chair as he tries to prolong the nation's economic expansion.
The Fed chairman's remarks suggest the Fed is unlikely to reduce rates when it meets later this month.
The Fed chairman said more evidence is needed that inflation is nearing the central bank's 2% target.