beijing powerful u.s. senator say concern state-owned chemchina buy swiss crop protection seed group syngenta synn.s 43 billion could use u.s. sovereign immunity laws shield claim u.s. court chinese state-owned entities argue sovereign immunity thus sue u.s. court u.s. foreign sovereign immunities act fsia 1976. acquisition china national chemical corp chemchina cnncc.ul syngenta large global investment chinese company u.s. regulatory clearance august despite concern lawmakers u.s. food security week u.s. congressional panel urge lawmakers take action ban chinese state-owned firm acquire u.s. company nov. letter u.s. senator chuck grassley post website chemchina say u.s.-incorporated businesses subject u.s. civil law fsia apply commercial activity grassley represent u.s. agricultural powerhouse state iowa say nov. 16 response remain concern chemchina could seek shield u.s. court jurisdiction chemchina indicate immunity would extend syngenta u.s. business company fail note immunity would otherwise apply wholly state-owned entity say website legal experts say sovereign immunity defense intend international law shield governments legal rule make foreign power typically apply commercial case chemchina acquisition process gain approval european commission deal expect close around end march letter grassley chemchina say chinese government interfere chemchina operations direct chemchina affiliate engage price-fixing competitors syngenta continue strategy management people culture headquarter basel job lose job go overseas result transaction say chemchina also say chinese government interfere operations direct chemchina affiliate engage price fix competitors key u.s. senator remain concern chemchina-syngenta deal