The ban will affect a small subset of industries but could be ruinous for those companies if the trade prohibitions go into effect in three weeks. US President Donald Trump said on Tuesday (local time) that he has ordered federal agencies to stop buying Canadian products through the government's main purchasing catalogue until Ottawa provides equal market access to American businesses and farmers. Key points and original sources are listed below.

• The ban will affect a small subset of industries but could be ruinous for those companies if the trade prohibitions go into effect in three weeks.S1

• US President Donald Trump said on Tuesday (local time) that he has ordered federal agencies to stop buying Canadian products through the government's main purchasing catalogue until Ottawa provides equal market access to American businesses and farmers.S2