Republican Sen. John Cornyn John CornynHillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Lawmakers introduce legislation to boost cybersecurity of local governments, small businesses On The Trail: Making sense of this week's polling tsunami MORE (Texas) created waves Friday with a tweet that said the Department of Justice is investigating 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, a leading Democratic presidential candidate.

Cornyn, a close adviser to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.), wrote in the tweet that “the Trump Justice Department is investigating foreign government influence, VP Biden conflicts of interest, and possible corruption.”

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Cornyn’s tweet immediately attracted attention, as any effort by Trump’s Justice Department to investigate a leading Democratic rival will stir controversy and prompt charges from Democrats that Trump is abusing his power for personal political gain.

It’s not clear, however, whether Justice is actually investigating Biden.

A Cornyn aide said his boss was referring to the ongoing investigation by John DurhamJohn DurhamSteele Dossier sub-source was subject of FBI counterintelligence probe Barr's Russia investigator has put some focus on Clinton Foundation: report Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE, the U.S. attorney in New Haven, Conn., whom Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE tapped in May to investigate the origins of the FBI’s investigation into possible collusion between the Trump campaign and Russian officials in 2016.

Cornyn also stated on Twitter that the Justice Department is probing “the provenance of the bogus opposition research compiled for the Clinton campaign produced by an ex-British spy,” referring to a dossier compiled by Christopher Steele, who at one point worked as an FBI informant and is believed to be central to the FBI’s decision to conduct a counterintelligence investigation of the Trump campaign.

The Department of Justice did not respond immediately to a request for comment from The Hill.

Kerri Kupec, a spokeswoman for the department, told The Middletown Press last month that Durham “is gathering information from numerous sources, including a number of foreign counties.”

“At Attorney General Barr’s request, the president has contacted other countries to ask them to introduce the attorney general and Mr. Durham to appropriate officials,” she said.

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 pressed Ukrainian President Volodymyr Zelensky in a July 25 phone call to investigate Biden as well as the possibility that individuals based in Ukraine interfered in the 2016 presidential election.

That phone call later triggered a whistleblower complaint alleging that Trump abused the power of this office. It also helped launch an impeachment inquiry from the House.

Asked on Friday whether the Justice Department is investigating Biden, Trump told reporters to refer the question to Barr.

"Well, that you’d have to ask Attorney General Barr, but I can tell you just as an observer, what I saw Biden do with his son, he is pillaging these countries and he is hurting us,” the president said.

In a nine-page complaint to the intelligence community’s inspector general, an unnamed whistleblower raised concern that Ukrainian officials were working with the Department of Justice to investigate Biden as well as allegations that Ukrainian officials had interfered in the 2016 election.

In the complaint, the whistleblower notes that “in several public comments, Mr. Lutsenko also stated that he wished to communicate directly with Attorney General Barr on these matters,” referring to Ukraine’s former prosecutor general Yuriy Lutsenko.

In a footnote, the whistleblower questioned whether Durham was investigating Biden as part of his broader probe into how the FBI’s investigation into possible collusion between the Trump campaign and Russian officials originated.

“In an interview with Fox News on 8 August, Mr. Giuliani claimed that Mr. John Durham, whom Attorney General Barr designated to lead this probe, was 'spending a lot of time in Europe' because he was 'investigating Ukraine.' I do not know the extent to which, if at all, Mr. Giuliani is directly coordinating his efforts on Ukraine with Attorney General Barr or Mr. Durham,” the whistleblower wrote, making reference to Trump’s 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.

Trump last year demanded the Department of Justice investigate whether the Justice Department under former President Obama “infiltrated or surveilled the Trump campaign for political purposes.”

The FBI launched a counterintelligence investigation into possible links between the Trump campaign and Russian officials in July of 2016, and in March of 2016 the FBI interviewed Trump campaign adviser Carter Page about his contacts in Russia.

Prior to the launch of that investigation, the FBI was working with former British intelligence officer Christopher Steele, the author of a dossier alleging a variety of improper conduct by Trump, then a candidate, as a confidential informant.

Trump’s allies in the Republican Party suspect the FBI’s investigation into Trump’s campaign may have been politically motivated.

GOP lawmakers in recent days have also raised concerns about payments of as high as $50,000 a month that Hunter Biden received as the paid board member of Burisma Holdings, a Ukrainian energy company that had been investigated in Ukraine for possible corruption.

Ukraine’s new top prosecutor, Ruslan Ryaboshapka, announced on Friday that he plans to review 15 past high-profile cases handled by previous prosecutors general, including the past investigation of Burisma.

The previous Ukrainian prosecutor general, Lutsenko, said late last month that he did not think Hunter Biden violated any Ukrainian laws.

Morgan Chalfant contributed.