Deadline? Who made this deadline? Trump badly needs it to give 90 days for voting in Congress, then signed before Mexico president's term finishes in Dec. 1st. The agreement could have problem with Mexican new president who could refuse to sign his predecessor's agreement., If Trump wants to dump Canada to go bilateral, it required 2/3 votes in congress. Democrats will block it, Nancy Pelosi said it clear: " NAFTA must include Canada. Bilateral is Trump's nightmare. Trilateral just needs majority in congress, which is much easy for Trump.
Common sense, time is in Canada side. Canada should hold on, Trump is bluffing. Oh, his " The Art of the Deal".