President Trump played hardball over the North American Free Trade Agreement renegotiations with Canada and Mexico on Sunday by threatening to pull out of talks and terminate the agreement in a tweet.

"We are in the NAFTA (worst trade deal ever made) renegotiation process with Mexico & Canada. Both being very difficult, may have to terminate?" Trump tweeted Sunday morning.

Trump railed against NAFTA on the campaign trail before his election and has wanted to pull the country out of the mid-1990s deal for months. Reports indicate Canadian Prime Minister Justin Trudeau talked him out of doing so earlier this year, but Trump has remained critical of the deal.

Trump ran on a more protectionist platform than many Republican candidates in recent elections, and has promised to renegotiate all of the country's trade deals now that he's in office.

Trump also reiterated another top campaign promise Sunday by promising to get Mexico to pay for his border all, perhaps his most recognizable pledge.

"With Mexico being one of the highest crime Nations in the world, we must have THE WALL. Mexico will pay for it through reimbursement/other," he tweeted.