President Trump has become the semiconductor sector’s leading decision maker, from new fees on exports to China to a brief demand for a C.E.O.’s firing.

Just days after calling for the resignation of Intel chief, Lip-Bu Tan, over his ties to China, Mr. Trump changed his tune.

Lip-Bu Tan, Intel’s top executive, said he was committed to the company after Mr. Trump called for him to step down over reported Chinese investments.