The European Union is enforcing $3.4 billion US in tariffs on U.S. products as of Friday in retaliation to duties the Trump administration has put on European steel and aluminum.

The goods targeted include typical American products like bourbon, peanut butter, and orange juice, in a way that seems designed to create political pressure on U.S. President Donald Trump and senior U.S. politicians.

Trump responded on Friday with a tweet threatening additional duties on "all their cars coming into the U.S." if the EU doesn't lift its tariffs.

"This response by the European Union is adequate, it is proportionate and it is reasonable. Needless to say, it is in full respect of EU and [World Trade Organization] rules," said European Commission spokesperson Alexander Winterstein...

This was excerpted from the 22 June 2018 edition of CBC News.