Silicon Valley Group (SVGI Quote) was up 1.6% in late morning, despite reported threats to its deal with ASML, a Dutch chip-equipment maker. The Wall Street Journal reported that U.S. lawmakers are opposing a bid for Silicon Valley by ASML. Opponents fear that the sale could threaten national security.

Silicon Valley Group is the leading maker of advanced lithography equipment for chip manufacturing, and it also makes lenses used in aerial and satellite photographer. ASML agreed to buy the company in October for $1.6 billion in stock.