Jan 29 (Reuters) - London copper inched higher on Wednesday, but lingered near a three-week low hit in the last session as U.S. President Donald Trump's threat to levy tariffs on copper imports kept the market under pressure. Benchmark copper CMCU3 on the London Metal Exchange (LME) ticked up 0.2% to $9,005.5 a metric ton by 0217 GMT. The metal touched its lowest since Jan. 8 in the previous session. Tariff concerns have resurfaced after Trump said on Monday he would impose tariffs on aluminium and copper - metals needed to produce U.S. military hardware - as well as steel, to entice producers to make them in the United States. The United States imports 38% of its copper needs and is highly dependent on aluminium imports, with supplies from other countries such as Canada and Mexico covering 82% of its annual consumption, according to BNP Paribas. The White House said on Tuesday that Trump still plans to issue 25% tariffs on Canada and Mexico on Saturday while weighing fresh tariffs on China. Meanwhile, the Federal Reserve will conclude its two-day policy meeting later in the day, where it is expected to hold interest rates steady, according to the CME Group's FedWatch Tool. Three-month aluminium CMAL3 was down 0.1% at $2,569.5. Zinc CMZN3 fell 0.1% to $2,771.5 a ton, while lead CMPB3 gained 0.2% to $1,939.5, tin CMSN3 was up 0.4% to $29,790 and nickel CMNI3 rose 0.3% to $15,485. The Shanghai Futures Exchange will be closed until Feb. 4 for the Lunar New Year holiday. (Reporting by Anushree Mukherjee in Bengaluru; Editing by Subhranshu Sahu) ((anushree.ashishMukherjee@thomsonreuters.com;)) (( For related news and prices, click on the codes in brackets: LME price overview RING= COMEX copper futures 0#HG: All metals news MTL All commodities news C Foreign exchange rates FX= SPEED GUIDES LME/INDEX ))