President Donald Trump praised Tim Cook, who’s stepping down as Apple’s CEO later this year, as “an incredible guy!!!” who had “an AMAZING career.”

Apple Inc.’s Tim Cook, who’s stepping down as chief executive officer later this year, told employees on Tuesday that he is “healthy” and plans to serve as executive chairman for a long time.

Ternus, who has spent over two decades at Apple and currently leads hardware engineering, was described by Cook as a key contributor to many of the company’s products.