U.S., Canada, and Mexico would promise to avoid devaluing their currencies for competitive purposes.

Talks are extended into 2018.

Talks are extended into 2018.

The potential dealbreakers are tempered by the pact's support in Congress.

White House expected to make a contentious proposal on cars.

White House expected to make a contentious proposal on cars.

Meeting the December target for a new agreement is unlikely, observers say.

Meeting the December target for a new agreement is unlikely, observers say.