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The Trump deadline effect

President Trump boards Marine One en route to Camp David.
President Trump boards Marine One en route to Camp David. Photo: Chip Somodevilla/Getty Images

One of the under-reported ways Donald Trump has changed Washington: Deadlines suddenly matter. We saw it last week when Trump hit allies — the European Union, Mexico and Canada — with steep steel and aluminum tariffs.

Why it matters: Trump had announced these tariffs back in March, but exempted some key trading partners. Trade lawyers and lobbyists following the situation told me they expected Trump to extend the deadlines when they expired on June 1, rather than throw these key relationships into further turmoil.