U.S. inflation slowed last month for the first time since September even as additional tariffs on steel and aluminum kicked in Wednesday that could send prices higher.

Inflation slowed more than expected in February and cooled for the first time in four months, but that progress may be short lived as President Donald Trump ramps up his trade war, which threatens to increase prices for Americans.

Consumer prices rose slightly during President Trump’s first full month in office, according to data released Wednesday by the Labor Department. The consumer price index (CPI) rose 0.2 percent in February from January and is up 2.