Sources: U.S. stopped Philippines rifle sale that senator opposed

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Washington (Reuters) — The U.S. State Department halted the planned sale of some 26,000 assault rifles to the Philippines' national police after Senator Ben Cardin said he would oppose it, Senate aides told Reuters on Monday.

Aides said Cardin, the top Democrat on the Senate Foreign Relations Committee, was reluctant for the United States to provide the weapons given concerns about human rights violations in the Philippines.

Related: UN rights body to PH: 'Promptly, thoroughly' probe drug killings

The relationship between the United States and the Philippines, a long-time ally, has been complicated lately by President Rodrigo Duterte's angry reaction to criticism from Washington of his violent battle to rid the country of illegal drugs.

Read: Duterte: I did not start this issue with the U.S.

More than 2,300 people have been killed in police operations or by suspected vigilantes in connection with the anti-narcotics campaign since Duterte took office on June 30.

The U.S. State Department informs Congress when international weapons sales are in the works. Aides said Foreign Relations committee staff informed State that Cardin would oppose the deal during the department's pre-notification process for the sale of 26,000-27,000 assault rifles, stopping the deal.

State Department officials did not comment.

Earlier this month, Duterte told U.S. President Barack Obama to "go to hell" and said the United States had refused to sell some weapons to his country, but he did not care because Russia and China were willing suppliers.

Read: In China, Duterte announces split with U.S.: 'America has lost'

According to some U.S. officials, Washington has been doing its best to ignore Duterte's rhetoric and not provide him with a pretext for more outbursts.

An open break with Manila could create problems for the United States in a region where China's influence has grown.

Reuters U.S. Asia Policy Correspondent David Brunnstrom contributed to this report.