The United States on Wednesday decided not to renew the US-Mexico-Canada Agreement (USMCA), in its current form, US trade Representative Jamieson Greer said in a statement

"The United States will continue to engage with Mexico and Canada to address the agreement's shortcomings and our trade deficits with these countries," Greer said.

Although it wasn't extended by the Wednesday deadline, the deal remains in force for another 10 years and will now be reviewed annually, which sets up the possibility of protracted and complicated negotiations over everything from tariffs to trade rules governing specific sectors.

The on-again, off-again negotiations are likely to cause more uncertainty for US automakers and farmers who depend on stable and interconnected supply chains underpinned by the deal.

Trump sours on his own deal