A second whistleblower has come forward in the impeachment inquiry against US President Donald Trump.
Mark Zaid, a lawyer for the original whistleblower in the case, said he would be representing a second whistleblower who had direct knowledge of the White House dealings with Ukraine.
He said the person is also an intelligence official.
The impeachment inquiry has centered on Trump's attempts to get Ukrainian president Volodymyr Zelensky to open an investigation into former vice president Joe Biden and his son, Hunter.
Trump and his Republican supporters have dismissed the complaint as politically motivated hearsay.

Ukraine's Odesa suffers major blackouts after Russian attack
Two killed in Ukrainian drone strike on Russia's Saratov
Thailand continues Cambodia strikes despite Trump's ceasefire claim
EU agrees to indefinitely freeze Russian assets, removing obstacle to Ukraine loan
Severe floods force mass evacuations in US state of Washington
