Monday is the deadline for pending tariffs on Mexican tomatoes.
The 90-day clock started in April, when the U.S. moved to end a 2019 suspension agreement.
Lobbying has picked up in Washington as talks come down the wire.
This week, Mexican growers asked the Commerce Secretary for another 90-day extension. It is the third request in two weeks.
Western states tend to support lower-cost imports. Growers in the south, including Florida, want stronger prices for domestic tomatoes.