TAIPEI, March 6 (Reuters) - Taiwanese chipmaker TSMC

is expanding investment in the United States because

of large U.S. customer demand, its CEO said on Thursday, adding

that its production lines there are already fully booked for

this year and the next two years.

The comments were made at a press conference held at

Taiwan's presidential office on Thursday.

Earlier this week, the world's largest contract chipmaker

announced a fresh $100 billion investment in the U.S. that

involves building five additional chip facilities, amid threats

from U.S. President Donald Trump to impose tariffs on

semiconductor imports.