(CNN) - A lawyer for the Ukraine whistleblower, whose complaint document triggered the House impeachment inquiry of President Donald Trump, has sent a letter to the White House warning the President to "cease and desist" attacking his client.
The President has also accused the whistleblower of partisanship though Trump said he had no personal knowledge of the person's identity.
The whistleblower's complaint alleges Trump abused his official powers "to solicit interference" from Ukraine in the 2020 election and that the White House took steps to cover it up.
A rough transcript released by the White House shows Trump repeatedly pushed Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden, Trump's potential 2020 political rival, and his son Hunter Biden.
Many of the central claims from the whistleblower's complaint have been corroborated by testimony from Trump administration officials and the partial transcript of the July 25 call between Trump and Zelensky, which was released by the White House.