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French-speaking Wallonia has steadfastly opposed it, saying the deal is bad for Europe’s farmers and gives too much power to global corporate interests.

In a last ditch bid to secure Walloon backing, EU trade officials are offering to tweak a political declaration appended to the treaty, an EU source said.

This is first of all an inner-Belgian matter.

Many EU leaders suspect the local government in Namur is using its devolved powers to play domestic politics. “This is first of all an inner-Belgian matter,” an EU source said.

Walloon Socialist leader Elio Di Rupo, one of the most vocal opponents of the deal, cast doubt a deal could be reached next week.

“They took years to negotiate #CETA and we are refused a few weeks,” Di Rupo, a former Belgian prime minister, tweeted on Sunday. “Will we reach a solution? All depends on the contents. If it doesn’t change enough, we will maintain our opposition.”

European Council President Donald Tusk, who chairs the collective body of the EU’s leaders, will speak to Belgian Prime Minister Charles Michel by late on Monday, EU sources said, before informing Trudeau’s government of the state of play.

“If Michel says he is not in a position to confirm that Belgium will be able to sign on Thursday, then we won’t have the summit,” a source said.

If postponed, no new summit date will be set, although the source said neither the EU nor Canada is willing to give up on a free trade pact that has been years in the making.