Former U.S. President Donald Trump is calling for the immediate resignation of Intel’s new CEO, Lip-Bu Tan, a longtime veteran of the semiconductor industry, over alleged conflicts of interest.

On Thursday, Trump wrote in a post on his Truth Social media platform: “The CEO of INTEL is highly CONFLICTED and must resign, immediately. There is no other solution to this problem.”

Trump’s accusation against Tan was brief, giving no further details of the alleged conflicts he said should force the Intel CEO’s resignation.

Tan, an Intel board member since 2018, was appointed to lead the world’s largest advanced chipmaker last month. In March, Intel’s board of directors replaced former CEO Pat Gelsinger with Tan after a board vote.

The news follows recent criticism of Tan from U.S. Senator Tom Cotton (R-AR). On Tuesday, Cotton sent a letter to Intel board chair Frank Yeary “expressing concern about the security and integrity of Intel’s operations” because of Tan’s “significant and longstanding financial and personal relationships with China.”

In his letter, Cotton cited Tan’s history as an “extreme Chinese tech investor,” including his work with the Chinese tech giant SMIC. In addition to these past investments in Chinese semiconductor companies, Tan has, through his own San Francisco-based investment firm as well as another company he runs out of Hong Kong, invested hundreds of millions of dollars in Chinese technology companies.

Tan’s appointment as Intel’s new CEO has also drawn increased scrutiny because of his past leadership at Cadence Design Systems, a U.S.-based company in the chip design software market.

Last week, Cadence announced that it had breached U.S. export controls by selling its chip design software to a Chinese university with close ties to China’s military. Trump’s call for Tan’s resignation appears to use Cadence’s export control violations as the basis for his case for Tan to step down from Intel’s CEO position “immediately.”

Intel and the White House did not immediately respond to requests for comment on Trump’s statement. But in New York, Intel shares fell 3 percent in pre-market trading on Thursday morning, following the news of Trump’s call for Tan’s resignation.

Tan is considered a Silicon Valley stalwart with decades of experience in semiconductors and venture capital. But his new role at Intel, coming at a critical time for the U.S. chip industry, has seen him take on a company that is struggling to keep up with its chief rival, TSMC.

Intel is the last U.S.-based company with the technical ability to make advanced semiconductors. But it has also been slower than other major chipmakers, such as TSMC, to capitalize on the most recent boom in artificial intelligence chips, the new front in the global chip race.

The U.S. government has been pumping Intel with billions of dollars in government loans and subsidies. This reflects the broader push from the Biden administration to increase domestic manufacturing and reduce U.S. reliance on overseas chipmakers, especially those in Taiwan and South Korea.

But Intel is still playing catch-up to TSMC on advanced chipmaking. On March 31, the day of Tan’s official appointment as CEO, Intel published a report warning that it was behind schedule in its attempts to scale advanced semiconductor manufacturing in the United States.

With Intel struggling to keep pace in advanced chip manufacturing, Tan’s appointment in March was met with the expectation that he would hit the ground running as Intel’s CEO.

Intel’s stock has declined over 40 percent over the past year, and Tan has made an effort to rein in costs, both through investments and layoffs, to improve profitability. But those cost-cutting moves have also come at a time of intense pressure on Intel to keep up with TSMC.

Senator Tom Cotton and other critics of Tan have also raised alarms about the new CEO’s previous business investments and close connections to China. Intel has also received a sizable amount of funding from the U.S. government, including direct loans and subsidies. But Intel’s receipt of government subsidies, Tan’s investments, and the recent export control violation from Cadence all raise “questions about Intel’s ability to fulfill these obligations,” Cotton wrote in his letter to Intel’s board chair.