A former White House aide told a congressional panel that one of her email accounts was hacked, possibly one she used as a member of President Trump's campaign team.
The tweets followed the resignation of Hope Hicks, the White House communications director and one of Mr Trump's longest-serving aides.
Hicks, who has worked for Donald Trump in various capacities since 2014, appeared before the House Intelligence Committee investigating Russian election-meddling on February 28 and was grilled by lawmakers for almost seven hours.
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Had Ms. Hicks's campaign account been the one hacked, it would have raised issues of who did it, why the Trump campaign was being targeted, and what information the hackers might have accessed.
President Trump confers with ex-White House Communications Director Hope Hicks in January.
Hicks is a key figure in the Russian Federation investigation due to her closeness to the president since the start of his 2016 campaign.
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During the testimony, Hicks also admitted to telling "white lies" on behalf of Trump.
Hicks's communications have come under scrutiny by both the House Intelligence Russia investigation and the investigation of special counsel Robert Mueller, who reportedly interviewed Hicks in December.
Hicks' correspondence has been an area of interest in the ongoing investigation into Russian meddling in the 2016, particularly as it relates to possible ties between the Russian government and the Trump campaign.
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A day after her committee testimony, Hicks announced her resignation from the White House, although it was apparently unrelated to her questioning and had been months in the making.