Julia Fair

USA TODAY

Trump adviser and son-in-law Jared Kushner is facing more scrutiny about his use of a private email address, as a Senate Democrat demands to know the extent he and other White House officials used such platforms for official business.

Sen. Ben Cardin of Maryland, the ranking Democrat on the Senate Foreign Relations Committee, sent a letter Tuesday to Secretary of State Rex Tillerson and White House Counsel Don McGahn asking whether any White House officials communicated via private email or text with a representative of a foreign government, political party or international organization.

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Kushner, who has played a large role in the administration's foreign policy, was explicitly mentioned in the letter.

“Mr. Kushner’s active role in arranging meetings and engaging in diplomacy, both in public and private, coupled with his use of unofficial email, raises questions as to whether any communications regarding representatives of foreign governments occurred through unofficial channels and could have been compromised,” Cardin wrote.

Cardin urged the importance that any communications that may have occurred over private email or other non-governmental platforms are appropriately preserved and secure.

Cardin also asked about any unofficial communications between the White House and State Department, as well as between the White House and representatives of any foreign entities.

Cardin requested the information, including copies of those exchanges, by Oct. 17.