METALS-London copper drifts as dollar firms on rate rise potential

(Adds comment, detail, updates prices) By Melanie Burton MELBOURNE, May 3 (Reuters) - London copper dropped on Wednesday from a three-week high hit the session before as the dollar ticked higher on expectations the Federal Reserve will signal a June rate rise later in the session. Nickel prices however could rally if Philippine lawmakers confirm controversial Environment Secretary Regina Lopez in her current job. The vote is due Wednesday. "If she is appointed, we expect nicke

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