The United States Federal Reserve has said it will raise interest rates by a quarter of a percentage point as inflation, driven by soaring fuel prices amid the US-Iran war, continues to weigh on the economy.

The Fed, which is the central bank of the US, said on Wednesday that it will hike interest rates by 25 basis points to 3.75 percent to 4 percent.

It is the first hike in more than three years and comes just weeks before the US midterm elections, despite repeated demands from US President Donald Trump to lower rates.

“Economic activity is expanding at a solid pace. While uncertainty remains elevated owing, in part, to geopolitical developments, domestic spending has been resilient,” the Fed said in a statement on Wednesday.

“Inflation remains elevated. Today’s policy action will support a timelier return to the Committee’s 2 percent goal. The Committee will deliver price stability.”

After Wednesday’s hike, Fed officials expect one more rate increase this year, according to their quarterly projections, and expect rates to remain unchanged through next year.

CME FedWatch, which tracks the likelihood of monetary policy decisions, forecast a 92.3 percent chance of the Fed increasing rates to 3.75 to 4 percent. A week ago, that forecast was a 40 percent chance of a quarter-percent rate increase.

Stress on economy

But in the days since, a slew of data shifted those expectations.

For one, consumer prices jumped in August by 0.4 percent, the highest increase in four months. Trump’s tariffs and capital spending to feed the artificial intelligence boom have also pressed prices.

On an annual basis, prices rose 3.4 percent, matching the increase recorded in July, while the job market remains healthy.

Since then, benchmark crude oil prices have continued to soar as strikes in the US-Israel war on Iran have intensified. Brent crude hovered near $109 per barrel on Tuesday.

The average price for a gallon of petrol is $4.36 ($1.15 per litre), up 14 cents in the past week, and up from $4.06 ($1.07 per litre) last month, according to the American Automobile Association (AAA), which tracks daily petrol prices.

Diesel, on the other hand, was at $6.31 ($1.67 per litre), the highest recorded average and roughly double from a year ago. That, in turn, is expected to further stoke prices as diesel is used in trucks to haul everything from fruits and vegetables to steel and cement.

At the same time, the benchmark 10-year Treasury yield broke above the psychologically important 5 percent threshold on Tuesday, hitting 5.02 percent, its highest level in 19 years. The yield serves as a benchmark for borrowing costs, including car loans and home mortgages, and is a bellwether for inflation.

“The economy is in an unusual place,” Michael Klein, professor of international economic affairs at Tufts University’s Fletcher School and executive editor of EconoFact, a nonpartisan economic and social policy publication, as unemployment remains at a comfortable level while higher prices continue to stick, sending inflation beyond the Fed’s target of 2 percent.

“There [has been] a lot of pressure on Chairman Warsh to raise interest rates because of inflation coming in high, and that has been compounded by concerns about Trump’s pressure” as the president has continued to demand that interest rates be lowered, Klein said.

“Higher interest rates tend to weaken the economy … but if the market believes that there’s going to be a rate increase, it’s priced in already as prices move on news, so this won’t be news,” Klein said, adding that should help steady yields.

The White House did not immediately respond to Al Jazeera’s request for comment on the rate increase.

Nearly three hours after the interest rate decision, Trump posted on Truth Social, his social media platform, that “Interest Rates in the United States should be 1%, or less, because we are the Best Credit in the World — BY FAR. Our Country is BOOMING with new Investment!”

He added, “LOWER THE INTEREST RATES FOR THE UNITED STATES OF AMERICA, AND FAST!” but didn’t mention Warsh directly in the post.

Later on Wednesday, when asked if he still had confidence in Warsh as Fed chair, Trump told reporters that he does.

“I’m relying on Kevin, but he’s got a very tough board. He’s got a board that was put there by a lot of other people. And the interest rates are too high. They’re not appropriate. I told Kevin, I said, ‘You might as well vote with the board because it’s just not going to matter,'” he said.

Trump repeatedly berated Warsh’s predecessor, Jerome Powell, for not lowering rates. The government even launched a criminal probe into Powell, which he said at the time were “pretexts” to undermine the independence of the Fed. (Al Jazeera)