A leading Canadian official on Friday refused to back away from a video featuring former President Ronald Reagan endorsing free trade, which triggered President Donald Trump‘s decision to cancel all tariff negotiations with Ottawa. The video will be aired as an ad during the World Series.

Trump abruptly terminated trade talks on Thursday due to accusations that Ontario was running a multimillion-dollar ad campaign denouncing the president’s tariffs on Canada by using allegedly “deceptive” audio and video from a 1987 speech Reagan gave on “free and fair trade.”