WASHINGTON -- Donald Trump blamed “poor planning” for the rapid drop in the U.S. stock market Monday morning as part of a global selloff in response to China’s continuing economic slowdown. The real estate mogul called for more support for his presidential campaign as a fix for the situation.

“Markets are crashing -- all caused by poor planning and allowing China and Asia to dictate the agenda,” Trump wrote on Twitter. “This could get very messy! Vote Trump.”

On what's being called "Black Monday," the Dow Jones Industrial Average fell as much as 1,000 points Monday morning after the market opened. After an hour, there was a small rally, and by 10 a.m., the Dow was down about 500 points. The Dow Jones Industrial Average (INDEXDJX:.DJI ) tumbled 1,089 points, or 6 percent, the S&P 500 index INDEXSP:.INX ) lost 5 percent, and the Nasdaq composite (INDEXNASDAQ:.IXIC ) dropped nearly 9 percent.

Trump continues to hold the top spot in polls for the Republican presidential primary. His success has partly been attributed to his willingness to deliver staunch criticism of how the U.S. negotiates with foreign powers, frequently saying in his campaign speeches that he would hire the best negotiators to deal with China and Mexico. Trump's real estate business, while not holding any Chinese properties, includes a wide range of international investments. Trump often remarks that he recently sold an American property to a Chinese businessman. 

2015-08-24T125906Z_423860176_GF10000180962_RTRMADP_3_CHINA-MARKETS An investor stands in front of an electronic board showing stock information at a brokerage house in Shanghai, China, August 24, 2015. Chinese stocks dived more than 8 percent on Monday morning, with the Shanghai index giving up all its gains for the year on investor disappointment that Beijing held back expected policy support at the weekend after markets shed 11 percent last week. Photo: Reuters/Aly Song

Trump frequently criticizes the current administration for its relations with China. If elected, has has said, he would improve negotiations with China and force the nation to more fairly do business with the United States.

“Our country is in serious trouble. We don’t win anymore,” Trump said during the first debate of GOP presidential candidates earlier this month, hosted by Fox News. “We don’t beat China in trade.”

He has cited China as one of the nations taking American jobs. “I’ll be the greatest jobs president that god ever created. I’ll take them back from China, Japan and Mexico,” Trump said in an interview with CNN.

In his response to the market, Trump said the U.S. is too closely tied to China and Asia’s markets. “As I have long stated, we are so tied in with China and Asia that their markets are now taking the U.S. market down. Get smart, U.S.A.,” Trump wrote on Twitter.