USMCA Sunset/Review Clause

This is from Trump's press conference at the G7 meeting: Q Are you close to a deal on NAFTA? Your Press Secretary said (inaudible). THE PRESIDENT: So two things can happen on NAFTA. We’ll either leave it the way it is, as a threesome deal with Canada

Here's a tweet from Daniel Dale of the Toronto Star: Trudeau says he wanted to meet with Trump to resolve NAFTA, but Pence told him that he couldn't meet with Trump unless Canada accepted an auto-termination "sunset clause" in the deal. He said Canada

Here is another interesting issue that came up at last week's House Ways and Means Committee hearing with U.S. Trade Representative Robert Lighthizer: Congressman Johnson: Can you tell me what the sunset clause is and what they are trying to accomplish with it? Ambassador Lighthizer: Absolutely, Congressman.