Documents released by House impeachment investigators late Tuesday indicate that Lev Parnas, an associate of Trump lawyer Rudy Giuliani, corresponded with Republican congressional candidate Robert Hyde about tracking the movements of the ex-envoy, Marie Yovanovitch.
Hyde criticized House Intelligence Chairman Adam B. Schiff for releasing the text messages between himself and Mr.
The documents show that Mr Parnas was in regular contact with Mr Giuliani as well as Ukrainian officials.
Among the documents is a note handwritten by Parnas on stationery from the Ritz-Carlton Hotel in Vienna, in which he appears to list tasks to carry out regarding Ukraine.
House Democrats say the messages add to the evidence they will present to the Senate in an impeachment trial due to start in earnest next week, after the House voted on Wednesday to send the impeachment charges over to the Senate.
The former New York City mayor met with multiple current and former Ukrainian officials and businessmen in an effort to dig up dirt on former Vice President Joe Biden's son Hunter Biden.
The revelations offered a new twist ahead of Trump's impeachment trial in the Senate; the president was impeached by the House previous year on suspicions that he improperly pressured Ukraine's government to investigate former vice president Joe Biden.
Toensing and her husband, attorney Joseph diGenova, are staunch Trump allies whose clients have included Dmitry Firtash, a Ukrainian energy magnate who is fighting extradition to the USA on bribery charges.
The lawmaker is named in the indictment only as "Congressman-1", but campaign finance filings identify him as former Representative Pete Sessions, Republican of Texas. The recall came as Giuliani was spreading unsubstantiated claims about the veteran diplomat, and as Trump was unhappy with her presence in Ukraine.
In their summary of the documents, the committees said Parnas "texted a copy of the letter to a close aide to then-President-elect Zelensky shortly after it was drafted".
White House counsel Pat Cipollone and outside lawyer Jay Sekulow are expected to lead the President's defense on the Senate floor, but are also expected to be joined by additional lawyers as the trial goes on, sources said.
Joseph Bondy, the lawyer for Lev Parnas, tweeted Monday that they had "worked through the night" to provide data from two of his client's smartphones to the House Intelligence Committee.
He did not dispute the validity of the texts, which show detailed monitoring of the physical location of fired USA ambassador to Ukraine Marie Yovanovitch, who was removed from her post past year amidst an intense lobbying push by Giuliani and his associates. "I'll get right in that", Hyde texted to Parnas in another set of messages.
Hyde later wrote that Yovanovitch was "under heavy protection outside Kiev".
Yovanovitch's attorney issued a statement calling for an investigation into the messages. Her phone is off. "They are willing to help if we/you would like a price", he wrote to Parnas.
Using crude language, Hyde implied he or his allies were monitoring Yovanovitch in Kiev, and suggested to Parnas that she should be removed from her position.
After texting about the ambassador, Hyde gave Parnas detailed updates that suggested he was watching her.
I have no idea if the President's associates had the US Ambassador to Ukraine under surveillance. "We trust that the appropriate authorities will conduct an investigation to determine what happened".
Democrats voted in December to impeach Trump for abuse of power and for obstruction of Congress.