"We write today to request information about the ethics rules that President Trump's daughter, Ivanka Trump, will be required to comply with, or has indicated she will voluntarily comply with, in her role as an advisor to the President," the senators wrote in the letter to Walter Shaub, the director of the OGE.

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They also want to know how OGE will make sure the first daughter complies with ethics rules.

The letter comes as Ivanka Trump's influence in the White House appears to be on the rise. She is poised to get an office in the West Wing and was invited to attend the W20 summit by German Chancellor Angela Merkel.

The two senators want to know if OGE has provided guidance, or if the White House has asked for guidance, on what ethics rules apply to Ivanka Trump, and if OGE or White House legal counsel could take disciplinary actions against the president's elder daughter, who isn't a government employee.