SummaryCompaniesIntel's testing raises national security concerns, China hawks warnACM denies national security threat, highlights US safeguardsTools were tested for use in Intel's most advanced chipmaking processWASHINGTON/SAN FRANCISCO, Dec 12 (Reuters) - Chipmaker Intel (INTC.O), opens new tab, has tested chipmaking tools this year from a toolmaker with deep roots in China and two overseas units that were targeted by U.S. sanctions, according to two sources with direct knowledge of the matter...