Steel and aluminum producers in America continued to rise in premarket trading as Donald Trump signed proclamation of reimposing 25% tariff on steel and aluminum.

Cleveland-Cliffs rose 5%, Nucor rose 2%; U.S. Steel, Alcoa rose 1%.

President Donald Trump ordered a 25% tariff on steel and aluminum imports, escalating his efforts to protect politically important US industries with levies hitting some of the country’s closest allies.

The tariffs will apply widely to all US imports of steel and aluminum, including from Canada and Mexico, among the country’s top foreign suppliers of the metals. The levies, which also include finished metal products, are meant to crack down on what administration officials said were efforts by countries like Russia and China to circumvent existing duties.

Trump cast the effort as one that would help bolster domestic production and bring more jobs to the US, and warned that the rate on metal tariffs “may go higher.”

The new rates will go into effect on March 12, at 12:01am Washington time, according to a pair of proclamations issued by the White House late Monday.

“Essentially, we’re putting on a 25% tariff, without exception, on all aluminum and all steel, and it’s going to mean a lot of businesses are going to be opening in the United States,” Trump said Monday as he signed the measures in the Oval Office.

Lattice Semiconductor's fourth-quarter earnings and expectations for next quarter beat Wall Street expectations, propping up shares.

Shares rose 14% in premarket trading.

The Hillsboro, Ore.-based company posted a profit of $16.5 million, or 12 cents a share, in the three months ended Dec. 28, compared with $98.7 million, or 71 cents a share, a year earlier.

Stripping out certain one-time items, adjusted per-share earnings were 15 cents, ahead of the 7 cents forecast by analysts, according to FactSet.

Revenue fell about 31% to $117.4 million, Lattice said Monday. Analysts surveyed by FactSet forecast revenue of $117.1 million.