The Pentagon does not comment.
A high-level visit may displease China.
The sources, one of whom is a Taiwanese official familiar with the situation, said on condition of anonymity that they were referring to Rear Admiral Michael Studeman.
The Navy’s website States that Studeman is the Director of the J2 service, which oversees intelligence in the US armed forces’ Indo-Pacific Command.
When asked if Studeman is actually in Taiwan, the Pentagon declined to comment.
The Trump administration has stepped up support for Taiwan; it’s about new arms sales and high-level visits.