President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE and his allies are going on offense after explosive revelations about his dealings with Ukraine opened up a new threat not just to his reelection but to his presidency as well.

Trump and those around him have questioned the credibility of the whistleblower behind a complaint alleging he sought help from the Ukrainian president to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, while insisting there was nothing improper about the phone call in question and that the media has skewed the facts.

ADVERTISEMENT

The president suggested on Friday that the whistleblower, whose identity remains unknown, may be a “partisan operative” and reiterated that he believed his conversation with Ukrainian President Volodymyr Zelensky to be “perfect.”

“If that perfect phone call with the President of Ukraine Isn’t considered appropriate, then no future President can EVER again speak to another foreign leader!” Trump wrote.

The Trump team has also blasted House Democrats for launching a formal impeachment inquiry on Tuesday as details of the July 25 call began to leak out through the press.

One of those targets came into focus Friday morning, when Trump called for the resignation of House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.), a leading voice in the Democratic effort to impeach the president.

He fired off a series of tweets in which he sought to defend himself and accuse Democrats of a “witch hunt,” the same descriptor he used for the 22-month Russia investigation by former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

ADVERTISEMENT

Trump lashed out at the lawmaker’s parody of the president’s call with Zelensky, demanding Schiff resign and be “investigated,” while calling him a “sick man.”

Hours later, White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE engaged in a lengthy and contentious back-and-forth with reporters during which she criticized House Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) for changing her mind on impeachment without first seeing the transcript of the July call.

“We have an impeachment inquiry based on nothing,” Conway told reporters at the White House.

“Nancy Pelosi finally capitulated to her angry mob,” said Conway, arguing there were “no high crimes and misdemeanors” and that Democrats are pursuing their inquiry with “a conclusion in search of evidence.”

The president and his aides have sought to fend off a wave of negative headlines stemming from the whistleblower complaint and a rough transcript of the call released by the White House showing Trump encouraged his Ukrainian counterpart to probe unsubstantiated allegations against Biden, the Democratic presidential front-runner.

Details of the Zelensky call galvanized support among House Democrats to launch a formal impeachment inquiry, a monumental step that some Republican strategists say could spell real trouble for Trump as the 2020 campaign intensifies.

“This is the most serious thing that the House can do. And look, this is the way that Trump deals with things — to rebut and sow anger and point blame in other places and so forth. That will work with his base; it’s not clear if that will work overall,” said GOP strategist Doug Heye, who noted there are still outstanding questions about the conversation between Trump and Zelensky.

“We just don’t know yet how far and deep this goes, but the further and deeper it goes — even for things that Trump didn’t necessarily do or say — still will cause him very serious political and or legal problems,” Heye said.

Public support for impeachment has been rising, with a new NPR/Marist survey showing 49 percent of Americans approving of Democrats’ impeachment inquiry into Trump, while 46 percent disapprove.

Some close to the White House downplayed the gravity of the call details and the effect of impeachment proceedings. One former White House official argued that while the rough transcript shows the conversation may have been “inappropriate,” it “sure isn’t impeachable.”

“While I think there’s some potential benefit to Trump, the most likely scenario is that impeachment ends up being a wash for both Republicans and Democrats politically — mostly because the transparently partisan nature of the entire situation will embolden the bases of both sides, but alienate the middle from fully throwing in with either party,” said another former White House official.

Trump and House Democrats are set for a seismic battle over the next several weeks, as congressional committees look to accelerate the impeachment push by subpoenaing documents and witnesses and scheduling hearings.

Conway dismissed speculation that the White House has immediate plans to set up an impeachment war room or hire more attorneys to help with the fight.

But the Trump campaign has gone into battle mode, announcing a multimillion dollar television ad buy Friday that highlights the unsubstantiated allegations that Biden pushed for the resignation of a Ukrainian prosecutor in order to prevent an investigation into a firm with ties to his son, Hunter.

The ad will appear on national cable outlets and digital platforms starting Sunday and will run for a week.

“Democrats want to deny Americans the opportunity to vote to re-elect President Trump and people need to know the facts,” Trump campaign manager Brad Parscale Bradley (Brad) James ParscaleMORE said in a statement. “This is a Joe Biden scandal and the Democrats are trying to use it to steal the election.”