Republican John Moolenaar and Democrat Raja Krishnamoorthi sent letters to the companies on Thursday amid pushback against expected U.S. rules that crack down further on tool shipments to China

Key House committee asks five American, Dutch and Japanese companies to detail their sales volume and customer base on the mainland.

It requested information from a handful of firms that make chip manufacturing possible about their commercial ties to China.

The top lawmakers on the House China select committee pressed various semiconductor equipment makers on their business sales with China amid growing concerns about the nation’s competitive advancements in chipmaking.