A former spokesman for Donald Trump's legal team was reportedly concerned the White House communications director could have been planning to obstruct justice.
Mark Corallo, who quit the role after two months following revelations about a meeting between Mr Trump's son Donald Jr and a group of Russians, is said to be planning to raise the issue with the special counsel investigating alleged links between the Trump campaign and Russia.
The New York Times reports he is planning to tell Robert Mueller about a conference call which took place last July, during which Hope Hicks allegedly told the President emails written by his son "would never get out."
In response to the Times' story, which cited three people with knowledge of the conversation, Ms Hicks' lawyer denied Mr Carollo's allegations.
"She never said that," Robert Trout said. "And the idea that Hope Hicks ever suggested that emails or other documents would be concealed or destroyed is completely false."
Mr Mueller's team is investigating whether there was any collusion between Moscow and the Trump campaign, or attempts by members of the Trump team to obstruct the investigation.
Mr Carollo's departure in July came amid media reports saying Mr Trump's legal team was reorganising and planning ways to limit Mr Mueller's probe.
US intelligence agencies have determined Moscow worked to sway the 2016 US election towards Mr Trump.
Moscow has denied it interfered and Mr Trump has repeatedly said there was no collusion.
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