The Republican National Committee asked the charity of Democratic nominee Hillary Clinton's family on Monday to produce all correspondence its staff had with the U.S. State Department while Clinton served as America's most senior diplomat.

Clinton's campaign to win the Nov. 8 presidential election has been dogged by criticism that donors to the Clinton Foundation may have expected special favors from the U.S. government in return. She says donors to the global charity receive no preferential treatment.

"The Clinton Foundation can play a vital role in filling important gaps in the public record by demonstrating its commitment to transparency and making public all correspondence its officials had with the State Department during Secretary Clinton's tenure," Reince Priebus, the RNC chairman, said in a letter to the foundation's president, Donna Shalala.