Mark Zaid, the attorney representing the whistleblower who sounded the alarm on President Donald Trump's dealings with Ukraine and triggered an impeachment inquiry, tells ABC News that he is now representing a second whistleblower who has spoken with the inspector general.

Zaid tells ABC News' Chief Anchor George Stephanopoulos that the second person -- also described as an intelligence official -- has first-hand knowledge of some of the allegations outlined in the original complaint and has been interviewed by the head of the intelligence community's internal watchdog office, Michael Atkinson.

The existence of a second whistleblower -- particularly one who can speak directly about events involving the president related to conversations involving Ukraine -- could undercut Trump's repeated insistence that the original complaint, released on Sept. 26, was "totally inaccurate."

Read more at abcnews.go.com.

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