Congressional investigators now want to interview Keith Schiller, President Donald Trump's longtime bodyguard-turned-White House aide, as part of their investigation into Russian interference in the 2016 presidential campaign, sources familiar with the investigation told ABC News.

Schiller, the former head of security for the Trump Organization who now serves as the White House director of Oval Office operations, is one of several Trump associates on the House Intelligence Committee's witness list in its ongoing investigation into Russian election interference.

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