President TrumpDonald John TrumpTrump criticizes supposed second whistleblower North Korea missile test raises fears of new capabilities Window narrows for Trump trade deals MORE on Saturday lashed out against House Democrats' impeachment inquiry while blasting the U.S. intelligence community whistleblower whose complaint has helped fuel the probe.

Trump asserted in a tweet that the whistleblower's complaint was "way off" and claimed that key Democrats didn't think he would release a transcript of his call with the Ukrainian president, which sparked the scrutiny.

"The so-called Whistleblower’s account of my perfect phone call is 'way off,' not even close," he tweeted.

"Schiff and Pelosi never thought I would release the transcript of the call. Got them by surprise, they got caught," Trump added, referring to House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffTrump criticizes supposed second whistleblower Collins: Trump's call for China to probe Biden 'completely inappropriate' Trump accuses Democrats of 'interfering' with 2020 election and 'continuing to interfere' with 2016 MORE (D-Calif.) and Speaker Nancy PelosiNancy PelosiSunday shows preview: Republicans on defense as new reports emerge on impeachment Trump accuses Democrats of 'interfering' with 2020 election and 'continuing to interfere' with 2016 GOP searches for impeachment boogeyman MORE (D-Calif.). "This is a fraud against the American people!"

The so-called Whistleblower’s account of my perfect phone call is “way off,” not even close. Schiff and Pelosi never thought I would release the transcript of the call. Got them by surprise, they got caught. This is a fraud against the American people!

— Donald J. Trump (@realDonaldTrump) October 5, 2019

Trump's tweet came the morning after The New York Times reported that a second intelligence official was considering whether to file their own whistleblower complaint over concerns about the president's dealings with Ukraine.

The person reportedly has more direct information than the first whistleblower, who did not have direct knowledge but cited “multiple White House officials with direct knowledge.”

Pelosi last week announced that Democrats would launch a formal impeachment inquiry into Trump over his dealings with Ukraine. The probe is being handled by the House Intelligence, Foreign Affairs, and Oversight and Reform committees.

The inquiry is largely centered around the whistleblower complaint filed over Trump's dealings with Ukraine. The complaint alleged that Trump tried to seek foreign help in the 2020 election, including by pushing Ukraine to investigate former Vice President Joe BidenJoe BidenTrump criticizes supposed second whistleblower North Korea missile test raises fears of new capabilities Trump told House Republicans that he made Ukraine call because of Perry: Report MORE and the Democratic presidential candidate's son Hunter Biden.

The White House released a rough transcript of the July 25 call that matched key details from the whistleblower complaint. Trump was quoted in the memo as asking Ukrainian President Volodymyr Zelensky to "look into" the former vice president. Trump this week also publicly encouraged Ukraine and China to launch probes into Biden. 

“I would think that if they were honest about it they’d start a major investigation into the Bidens,” Trump told reporters at the White House when asked about Ukraine.

House Democrats have ramped up their impeachment probe in recent days, issuing a subpoena on Friday for Ukraine-related documents from the White House and issuing a request for similar information from Vice President Pence.

“We deeply regret that President Trump has put us—and the nation—in this position, but his actions have left us with no choice but to issue this subpoena,” Schiff, in addition to Oversight and Reform Committee Chairman Elijah CummingsElijah Eugene CummingsIntel Dem: No reason for White House to defy subpoena unless Trump is 'guilty' Trump rails against whistleblower, impeachment inquiry Overnight Defense: House Dems subpoena White House for Ukraine documents | Pence pulled into inquiry | GOP senator says he confronted Trump over Ukraine aid | Iran hackers target 2020 campaign MORE (D-Md.) and Foreign Affairs Committee Chairman Eliot EngelEliot Lance EngelSunday shows preview: Republicans on defense as new reports emerge on impeachment Intel Dem: No reason for White House to defy subpoena unless Trump is 'guilty' Trump rails against whistleblower, impeachment inquiry MORE (D-N.Y.), wrote to acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyIntel Dem: No reason for White House to defy subpoena unless Trump is 'guilty' Trump rails against whistleblower, impeachment inquiry Trump has ordered national security staff cut: report MORE on Friday.

Secretary of State Mike PompeoMichael (Mike) Richard PompeoTrump defense head says US has stepped up attacks on Taliban since talks broke down Defense chief on Ukraine: 'My aim is to keep the department apolitical' Trump rails against whistleblower, impeachment inquiry MORE had already received a subpoena. Pompeo said Saturday that he has made contact with the committees on the matter. A Foreign Affairs Committee official confirmed that the panel had been contacted but said that Pompeo missed the Friday deadline for documents. 

Updated: 11:29 a.m.