WASHINGTON (CNN)  -- President Obama on Tuesday vowed to invest the resources needed to address the threat posed by drug traffickers in Mexico. A police convoy moves in Ciudad Juarez, Mexico, last month, across the U.S. border from El Paso, Texas. "We are going to continue to monitor the situation, and if the steps we have taken do not get the job done, then we will do more," he told reporters Tuesday night. He praised the efforts of Mexican President Felipe Calderon to counter drug cartels, which "have gotten completely out of hand," but said the United States must take further steps, such as ensuring that illegal guns and cash do not flow from north of the Rio Grande to the cartels in Mexico.
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NEW: Obama says plan seeks to halt weapons from entering Mexico from U.S.
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Homeland security chief says plan tries to prevent "spillover violence" in U.S.
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More federal agents, equipment and resources to be moved to Mexican border
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Gun control advocacy group says Mexican drug gangs exploit weak U.S. gun laws
The announcement comes shortly ahead of planned trips by three Cabinet secretaries to Mexico before @placeholder visits there next month.