White House Says Adjusting Imports Of Commercial Aircraft, Jet Engines, And Aircraft And Engine Parts Into United States; Secretary Of Commerce Found U.S. Aircraft Industry Is Facing Challenges To Adequately Meet Economic And National Security Demands; Secretary Of Commerce Found That The United States Aircraft Industry Is Too Reliant On Foreign Supply Chains; Trump Directs Commerce Secretary And USTR To Negotiate Agreements With Trading Partners To Address Threatened Impairment Of National Security