In the letter, Cummings noted that Kushner's lawyer had told Congress in December that Kushner used WhatsApp as part of his official duties but did not say whether such messages included classified information.
The Oversight Committee said it's also learned that former Deputy National Security Adviser K.T. McFarland and former White House strategist Steve Bannon also used personal emails to conduct business related to sensitive nuclear technology.
Elijah Cummings: White House officials using personal accounts to do official work
Cummings said in his letter that a law governing presidential records prohibits top White House officials, including the president and vice-president, from using non-official electronic messaging accounts.
House Oversight Chairman Elijah Cummings said Thursday his committee has obtained new information that several senior White House officials have used personal email and messaging accounts to conduct government business, asserting that President Donald Trump's son-in-law communicated with foreign leaders through a private messaging application that appears to lack adequate safeguards.
That proposal is under investigation by Cummings' committee, which is looking into information from whistleblowers who have said they witnessed "abnormal acts" within the Trump National Security Council involving senior White House officials who were pushing the plan.
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The White House sent its denial in a letter to Congress, according to reports by The Hill newspaper and CNN. He also contended that Trump's daughter Ivanka Trump, also a senior adviser, may be in violation of the Presidential Records Act by her use of private emails.
The White House sent a letter to Schiff and other committee chairmen explaining why it had refused to hand over communications with Russian Federation.
In one letter to Secretary of State Mike Pompeo, the three lawmakers said they wanted to know whether any Trump-Putin communications had led to the "reconsideration, modification, or implementation" of any aspect of American foreign policy. He acknowledged referring questions about Kushner's contacts through WhatsApp to the White House, and argued that Kushner "follows the protocols", including over classified information.
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Meanwhile, the committee said that Ivanka had been receiving official emails on her personal account, and has not been forwarding them to her official White House account as required by law. Now, he said, she "always" forwards emails to her official account.
According to a February 22, 2017 directive from the White House Counsel's Office, all White House personnel are required to "conduct all work related communications on your official EOP email account" except under "emergency circumstances".
Lowell also said his discussion with the committee about Ivanka Trump's emails was specifically about the period before September 2017. An attorney for McFarland declined to comment.
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If true, the claims would raise questions about the White House's handling of online security and classified information, the very same charges that Trump successfully used against Hillary Clinton over her private email server in the 2016 election. "The Committee requests that you confirm by March 28, 2019, whether you intend to comply voluntarily with its requests or whether the Committee should consider alternative means to obtain the information it needs to conduct its investigation".