President Donald Trump is using his love of tariffs to threaten high-profile American companies. Over the past month, Trump has said he’d like to target two specific and very different companies – Apple and Mattel – with tariffs aimed at their key products over comments by their CEOs.

While there are many examples of presidents pressuring industries, Trump’s new threats against Apple are more unusual — and they probably won’t work.

Apple Inc. shares are coming off their longest selloff in more than three years, as escalating attacks from the White House threaten to further erode the company’s profit outlook, suggesting the stock’s struggles this year are far from over.