On a day when the stock market opened down 1,200 points, Gov. Chris Christie put the blame squarely on President Barack Obama.

NEW YORK, NY - AUGUST 24: A trader works on the floor of the New York Stock Exchange on August 24, 2015 in New York City. (Photo by Spencer Platt/Getty Images)

Christie blamed the president for borrowing too much money from China to prop up the U.S. economy, and when China's markets fail, the U.S. economy sinks.

In recent weeks, Christie has been sharpening his attacks on Obama, Hillary Clinton and his fellow Republicans as he tries to keep his presidential bid alive.

Christie is scheduled to make a rare appearance in New Jersey today at Rutgers University where he will hold a press conference encouraging New Jersey leaders to oppose the controversial Iran deal.