WASHINGTON — Federal Reserve Chairman Jerome Powell told lawmakers Tuesday that strong economic growth will keep the central bank on a path to gradually raise interest rates. But he noted that President Donald Trump’s get-tough trade policies run the risk of dampening future growth if they lead to permanently higher tariffs.

Delivering his twice-a-year report on monetary policy to Congress, Powell gave an upbeat assessment of the economy’s prospects. He said the economy’s performance has enabled the Fed to dial back the “extra boost” it began implementing a decade ago to help lift the economy out of the Great Recession.

The Fed’s plan for raising rates slowly is “running smoothly,” Powell said. And the central bank expects the job market will remain robust and inflation will hover near the Fed’s 2 percent target over the next several years.

“Our policies reflect the strong performance of the economy and are intended to help make sure that this trend continues,” Powell said before the Senate Banking Committee.

Private economists said that Powell’s remarks sent a clear signal that the Fed, which has already boosted rates twice this year, expects to remain on its current projected path of raising rates another two times this year.

“Although trade tensions remain a downside risk, we continue to expect strong activity growth and rising inflation to prompt the Fed to raise interest rates in September and December and twice more in early 2019,” said Andrew Hunter, U.S. economist at Capital Economics.

Powell faced a number of questions on trade, with both Democratic and Republican senators seeking criticism of the Trump administration’s policies of imposing punitive tariffs on billions of dollars in imports.