The ministers leading NAFTA negotiations ended the latest round of high-level talks saying they’re extending discussions into the first quarter of 2018 to resolve differences after Canada and Mexico rejected what they see as hardline U.S. proposals.

After laying out the Trump administration’s most aggressive NAFTA demands to date, chief U.S. negotiator John Melle was asked on Oct. 15 how things are progressing. “Fabulous,” he said, smiling and shrugging before entering a negotiating room once more.

NAFTA talks have resumed with the U.S. administration looking increasingly isolated in its proposals to change the trade pact, as key figures raised the prospect of a collapse in negotiations.

U.S. officials in NAFTA negotiations are making proposals on battleground issues that Canada and Mexico would never agree to, intensifying doubts of reaching compromise on their tight timeline, according to three officials familiar with the talks.