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 on Wednesday said the country should find out the identity of the person who provided information to a whistleblower who raised concerns about his phone call with the Ukrainian president.

Trump railed against the whistleblower during an Oval Office meeting with the president of Finland, telling reporters that the individual portrayed his July 25 call with Ukrainian President Volodymyr Zelensky in a "vicious" way.

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"In other words, he either got it totally wrong, made it up, or the person giving the information to the whistleblower was dishonest," Trump said. "And this country has to find out who that person was, because that person's a spy, in my opinion."

Trump's attacks on the whistleblower come as members of both political parties have voiced support for upholding legal protections for the individual.

"I think a whistleblower should be protected if the whistleblower is legitimate," Trump said when asked about those comments from lawmakers.

Trump has gone on the offensive against the whistleblower, who anonymously filed a complaint with the intelligence community inspector general in August after they were concerned by Trump's conduct on a July 25 call with the Ukrainian president.

The whistleblower complaint, which was made public last week, matches with a rough White House transcript of the call. It alleges that Trump urged the Ukrainian president to look into Democratic presidential candidate 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 and that the White House sought to contain access to the contents of the call.

The complaint was based on firsthand information and information from other sources, the inspector general of the intelligence committee said this week.

During a conversation with U.S. diplomats last week, Trump reportedly suggested that those behind the whistleblower complaint should face severe punishment like spies did decades ago.

Trump has blasted the whistleblower as a partisan and questioned their loyalty to the country. He has claimed he has a right to interview the individual, even though protections exist to keep a whistleblower's identity anonymous.

The Whistleblower Protection Act makes it a violation for federal agencies to threaten retaliation against individuals who come forward to raise concerns of wrongdoing within the government.

"No one should be making judgments or pronouncements without hearing from the whistleblower first and carefully following up on the facts," Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa) said in a statement on Tuesday. "Uninformed speculation wielded by politicians or media commentators as a partisan weapon is counterproductive and doesn’t serve the country."

Rep. Paul Mitchell Paul MitchellGOP wants more vision, policy from Trump at convention Loomer win creates bigger problem for House GOP Lisa McClain wins Michigan GOP primary in race to replace Rep. Paul Mitchell MORE (R-Mich.), a member of House GOP leadership, said late Tuesday that the law protecting whistleblowers should be respected.

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.) said at a press conference Wednesday morning that Trump's attacks on the whistleblower amounted to an "incitement of violence."