A China-backed bid for chipmaker Micron Technology Inc. would encounter close scrutiny by American national security officials worried about Chinese control of U.S. technology firms.

China’s Tsinghua Unigroup Ltd. is preparing a bid for Idaho-based Micron, according to a person familiar with the matter. Such an acquisition would give China the world’s fifth-largest chipmaker by revenue, one able to compete with the likes of Samsung Electronics Co. and SK Hynix Inc. with manufacturing capabilities in the U.S., Japan and Singapore.

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