U.S. President Donald Trump and Senator Bob Corker exchanged insults, with Trump blaming his fellow Republican for the 2015 nuclear deal with Iran, while Corker said the president could be leading the nation to "World War III."

The sharply worded exchange on October 8 came amid signs that Trump might decline this week to certify the accord, a move that would add to tension between the United States and Tehran and cause concern among other signatories to the deal.

Trump has repeatedly denounced the landmark deal, which was signed under President Barack Obama, and told the UN General Assembly last month that it is "one of the worst and most one-sided transactions the United States has ever entered into."

Trump faces an October 15 deadline to certify that Iran is in compliance with the accord. If he does not, Corker -- as chairman of the Senate Foreign Relations Committee -- would play a key role in determining whether U.S. sanctions lifted under the deal are reinstated.

During the U.S. political debate over the nuclear deal, which was opposed by Republican lawmakers, Corker co-wrote the measure requiring congressional approval for the deal and required the president to certify that Iran was complying every 90 days.

In the past, Corker has said he considers the deal flawed, but he has expressed opposition to scrapping the agreement altogether.

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