Bill Theobald

USA TODAY

WASHINGTON — The independent investigative unit of Congress — the Government Accountability Office — is reviewing the conduct of Donald Trump's transition to the presidency, including whether their were conflicts of interest or violations of protocol or security precautions.

The review comes at the request of Rep. Elijah Cummings, D-Md., and Sen. Elizabeth Warren, D-Mass., who sent a letter to the GAO in November 2016.

The letter recounts Trump's various business interests and questions about whether he had followed through on promises to separate himself from his empire.

"Mr. Trump's conflicts of interest raise questions about the taxpayer-funded expenditures associated with the transition," the two wrote. For example, Trump charged the Secret Service $1.6 million for flights that were on planes that he owned.

The letter states that foreign leaders, who had difficulty reaching Trump, talked to him on his personal cellphone, raising concerns about security.

The GAO response, dated last week, confirms that the review was taking place "as discussed with your staff on Feb. 27, 2017." It states a draft report is expected to be completed in June and sent to relevant agencies.

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