The Obama administration is denying that its efforts to build ties with China have hurt relations with Taiwan.
Kurt Campbell, the top diplomat for East Asia, came under fire Tuesday from both Republican and Democrat lawmakers critical of the administration's decision against supplying new F-16 fighter jets to the island.
Campbell told the House Foreign Affairs Committee that efforts to improve relations with Beijing have contributed to historic levels of stability across the Taiwan Strait.
He also denied that Washington gave advance notice to China that it would be providing only upgrades to Taiwan's existing F-16 fleet.
Committee chair Ileana Ros-Lehtinen said the U.S. appeared timid in the face of China, which she described as "on the march in Asia."