In what Donald Trump has called "economic D-Day," the US says the new economic sanctions will be "the single greatest financial offensive ever marshaled." Tehran says any support of the measures is an "act of war." Americans are bracing for the potential impact on oil and gas prices as President Donald Trump prepares to unveil his “economic D-Day” sanctions on Iran. Key points and original sources are listed below.

• In what Donald Trump has called "economic D-Day," the US says the new economic sanctions will be "the single greatest financial offensive ever marshaled." Tehran says any support of the measures is an "act of war."S1

• Americans are bracing for the potential impact on oil and gas prices as President Donald Trump prepares to unveil his “economic D-Day” sanctions on Iran. It comes as fallout from the administration’s intensifying trade war with Canada grows. NBC's Gabe Gutierr...S2