Several participants at the central bank's September rate-setting meeting expressed support for raising the base rate above a neutral level to keep inflation in check, according to minutes released last night.
U.S. President Donald Trump says the biggest menace to his administration is the U.S. Federal Reserve.
But, amid brisk American expansion, some Fed policymakers also warned of looming dangers to the world economy, such as the potential for a strengthening United States dollar and possible contagion from sputtering emerging markets, according to minutes from the Fed's most recent meeting three weeks ago.
The US Federal Reserve has signalled there will be another rise in interest rates this year, despite opposition from the White House and growing concerns about the impact on emerging market economies.
The president has stepped up those attacks in recent weeks, going so far in an interview Tuesday as calling the Fed's rate hikes "my biggest threat".
As well as making life more hard for USA exporters, a stronger greenback also raises the borrowing costs of many heavily-indebted emerging market economies, such as those in Latin America which have high levels of dollar-denominated borrowing.
That's according to the minutes of the latest Fed meeting, in which every policymaker backed a move to raise interest rates in September.
This would move U.S. interest rates slightly above what policymakers say is "neutral" - that is, neither slowing nor speeding the economy - but some participants said the Fed may need to go even further than that.
A few participants expected rates would need to rise enough to modestly restrain economic growth, even as two others "indicated that they would not favor adopting a restrictive policy stance in the absence of clear signs of an overheating economy and rising inflation".
Meanwhile, the Fed took notice of clouds forming on the horizon.
"There are a lot of other people there I'm not so happy with", he said.
Stronger US currency makes American exports more costly to foreign buyers, possibly weighing on growth, and makes many debt payments more costly for foreign borrowers.
Though the minutes did not refer to any of Trump's criticism, its message of further rate increases suggests that policymakers are not fazed by it.
Interest rate increases ripple through the economy, making loans more expensive for businesses and consumers and thereby slowing investment and spending.
Wall Street, which had struggled through much of the day, closed slightly lower, with stocks paring losses after the minutes' release.