WASHINGTON — Two GOP senators are raising grave concerns about Chinese access to America’s National Laboratories , warning that Beijing could secretly be collecting sensitive national security information. In a letter to Energy Secretary Chris Wright, Sens. Tom Cotton (R-Ark.) and Mike Lee (R-Utah) cited data showing that Chinese nationals made roughly 1,900 short-term visits and undertook 1,300 long-term research assignments at the 17 federally funded national laboratories during fiscal year