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 Saturday defended his reported push for Ukraine's 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, maintaining his discussion with Ukraine's leader earlier this summer was "perfectly fine and routine."

In a pair of tweets Saturday morning, Trump argued that the news media was avoiding coverage of Biden's past ties to Ukraine and continued to highlight the former vice president's efforts to convince the country to fire a top prosecutor in 2016.

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"The Fake News Media and their partner, the Democrat Party, want to stay as far away as possible from the Joe Biden demand that the Ukrainian Government fire a prosecutor who was investigating his son, or they won’t get a very large amount of U.S. money, so they fabricate a story about me and a perfectly fine and routine conversation I had with the new President of the Ukraine," Trump tweeted.

"Nothing was said that was in any way wrong, but Biden’s demand, on the other hand, was a complete and total disaster. The Fake News knows this but doesn’t want to report!" he added.

....story about me and a perfectly fine and routine conversation I had with the new President of the Ukraine. Nothing was said that was in any way wrong, but Biden’s demand, on the other hand, was a complete and total disaster. The Fake News knows this but doesn’t want to report! — Donald J. Trump (@realDonaldTrump) September 21, 2019

Democrats and other critics of the president have hammered Trump in recent days over reports of his repeated efforts to lobby Ukraine to launch an investigation into Biden, the current Democratic presidential front-runner, arguing that it amounts to foreign interference in a U.S. presidential election.

The Wall Street Journal reported Friday that Trump urged Ukrainian President Volodymyr Zelensky to investigate Biden during a call in July, telling him roughly eight times to work with his personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE on the matter.

Trump and other Republicans argue that Biden's efforts in 2016 to urge Ukrainian officials to fire the country's top prosecutor were motivated by a probe into a company on which Biden's son Hunter served as a board member.

The prosecutor in question later resigned after being the target of corruption allegations, while no evidence has emerged to support the claim launched by Trump allies about Biden's efforts to urge Ukraine to fire the official.

Biden dismissed the allegation on Friday while blasting Trump amid rising scrutiny over a whistleblower complaint reportedly involving a call the president had with a foreign leader.

“Not one single credible outlet has given any credibility to his assertion. Not one single one,” Biden said of Trump's allegation against him. “So I have no comment except the president should start to be president.”

Trump's defense of his conversations with Ukraine's leader comes just a day after he asserted it "doesn't matter" what the two leaders discussed while calling for an investigation into Biden once again.

"It doesn't matter what I discussed, but I'll tell you this, somebody ought to look into Joe Biden's statement," Trump told reporters at the White House while hosting the prime minister of Australia.

The president has battled controversy for days after it was reported that a whistleblower in the intelligence community raised alarms over a promise Trump allegedly made to a foreign leader, supposedly involving Ukraine.

It's unclear if the whistleblower complaint reportedly involving Trump and Ukraine is related to the proposed Biden investigation.

Acting Director of National Intelligence Joseph Maguire has reportedly refused to release the contents of the whistleblower complaint to members of Congress.

Lawmakers have pushed for the whistleblower complaint to be released to them in full, while some Democrats have renewed calls for 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.) to support impeachment proceedings in the wake of the news.