In a tweet early Saturday, Trump said that "the so-called Whistleblower's account of my ideal phone call is 'way off, ' not even close". "They must be stopped!".
In a letter, the Democratic chairmen of three House committees cite reports that a Pence aide may have listened to the 25 July phone call in which Trump pushed Ukraine's new president - who was waiting for hundreds of millions of dollars of United States military aid that had been withheld - to investigate unfounded charges that Biden was involved in corrupt activities there.
The investigations were touched off by reports that an original whistleblower - reportedly a CIA analyst - had filed a formal complaint to the intelligence community inspector general about Trump's alleged pressuring of Zelensky.
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The subpoena, issued by the House Oversight Committee in consultation with the Intelligence and Foreign Affairs Committees, after the White House didn't meet Democrats' Friday deadline to turn over the requested records, also included information about millions of dollars in military aid withheld from Ukraine over the summer.
The subpoena followed a demand earlier for documents from US Vice President Mike Pence.
Romney, who lost the 2012 election to Democratic incumbent President Barack Obama, criticized Trump on Friday for asking China to investigate former Vice President Joe Biden, who is seeking the 2020 Democratic presidential nomination.
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"4 million people call LA home", a tweet accompanying the video by the Los Angeles Police Department said. It's still unclear if Zamourka will accept, but this is just the latest of her exciting new prospects.
There's no clear-cut procedure in the Constitution for launching an impeachment inquiry, leaving many of these questions about obstruction untested in court, said Allan Lichtman, a history professor at American University.
"I don't care about Biden's campaign but I care about corruption", he told reporters.
"We wanted to make sure that if we underwrote Javelin missile systems, something that the previous administration refused to do, we wanted to make sure we were doing this with a government that was straight up and would use that money for the things that it said it would use that money for".
Trump pushed back hard, saying there was no quid pro quo, and in an effort to recast the entire saga, insisting it was his responsibility to investigate "corruption".
In a signal of how Kiev will handle investigations being watched in Washington, Ukrainian prosecutors said they would review 15 old probes related to Burisma's founder but added that they were unaware of any evidence of wrongdoing by Biden's son.
Late Thursday, House investigators released a cache of text messages that showed top US diplomats encouraging Ukraine's newly elected president to conduct an investigation linked to Biden's family in return for granting a high-profile visit with Trump in Washington.
President Trump resumed his attack on Sen.
Trump continued, "Mitt Romney never knew how to win".
At the time, the Trump administration was withholding hundreds of millions in aid for Ukraine and Democrats said they suspect Trump was using USA foreign policy and taxpayer money for his personal political gain.