Intel shares dropped Thursday following a social media post by former President Donald Trump demanding the immediate resignation of the company’s CEO, Lip-Bu Tan.

In a Truth Social post, Trump accused Tan of being “highly CONFLICTED” and insisted that “there is no other solution to this problem” than his resignation.

The post triggered a sharp reaction from investors, sending Intel shares down 5% in premarket trading.

Tan was appointed Intel CEO in March, following the departure of Pat Gelsinger, as the semiconductor giant sought to recover from a period of declining sales and market share.

Concerns over Tan’s business ties have recently come under political scrutiny. Earlier this week, Senator Tom Cotton (R-Ark.) sent a letter to Intel’s board questioning Tan’s connections to Chinese firms and citing a past criminal case involving Cadence Design Systems, where Tan served as CEO until 2021.

“Intel is required to be a responsible steward of American taxpayer dollars and to comply with applicable security regulations,” Cotton wrote, according to Reuters. “Mr. Tan’s associations raise questions about Intel’s ability to fulfill these obligations.”

Reuters previously reported that Tan has invested in several Chinese technology firms — some with alleged links to the country’s military — either directly or through venture capital funds.