Intel CEO Lip-Bu Tan defended his integrity and vowed to continue leading the semiconductor company through a "critical moment."

Intel stock dropped 4% soon after Trump's post. Shares entered Thursday up less than 2% this year. Tan assumed the CEO role at the struggling chipmaker in March. Late last month, it was reported that Intel was looking to spin off its networking unit as it moves to shed assets under Tan.

President Trump called on the CEO of Intel to resign on Thursday, prompting the technology company's stock to slip before the opening bell.