Former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and his son Hunter Biden aren’t on trial in the Senate, but that’s done little to stop them from dominating the conversation in the Capitol.

The GOP feud with the Bidens has loomed over President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE’s impeachment trial, from the dozens of mentions by the House impeachment managers to questions being fielded by senators amid the media frenzy.

The pattern has become self-fulfilling: The more House managers mention the Bidens, the more Senate Republicans bring them up, the more Senate Democrats get asked about them as potential witnesses.

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Sen. Josh Hawley Joshua (Josh) David HawleyRenewed focus on Trump's Supreme Court list after Ginsburg's death What Facebook's planned change to its terms of service means for the Section 230 debate Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Mo.), illustrating the loop, argued that the House managers’ repeated mentions of Hunter Biden underscored the need for him to be called as a witness.

“The House managers went into a very detailed discussion of the Burisma-Biden situation, which I think will prove to have been a major error,” Hawley told reporters. “If we’re going to call witnesses, I think it’s now clear that we absolutely must call Hunter Biden and we probably need to call Joe Biden based on the House managers’ presentation.”

Senate Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE (R-S.C.) also went on an unprompted five-minute rant about the Bidens, chastising reporters for not digging deeper into the family and Ukraine. Hunter Biden has emerged as a fixation for Republicans because of his work for Burisma Holdings, a Ukrainian energy company.

“The thing that I wanted to talk to you about was the Biden connection. I don’t know how many times it was said by the managers that the Biden conflict of interest allegation has been debunked. ... I know a lot about the Trump family and their dealings in Russia, I don’t know anything about the Biden connection to the Ukraine,” Graham said.

“That’s becoming relevant because they talked about it almost 50 times,” Graham added.

Their comments come after Sen. Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE (R-Texas) told reporters on Wednesday night that House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE’s (D-Calif.) mention of Hunter Biden made his testimony “crucial."

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“House Democrats perhaps unintentionally threw Joe Biden under the bus,” Cruz added on Thursday.

Republicans, including Cruz, have floated the idea of “witness reciprocity," meaning that if Democrats are able to successfully call former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE or another of the four witnesses they want to testify then Trump’s team should be able to call its own witness, in particular Hunter Biden.

That chatter kicked into overdrive this week when The Washington Post, citing unnamed sources, reported that the idea was being discussed among Democrats. Democrats are publicly shooting down the idea but are still routinely being asked about a witness swap both during press conferences and in hallway interviews.

“There was one report that I thought was false, and now everyone is jumping on it,” Senate Minority Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.) told reporters, asked about a swap.

Sen. Christopher Coons Christopher (Chris) Andrew CoonsBiden promises Democratic senators help in battleground states Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Del.), who was quoted in the Post article, added that he had “no conversations about that at all” about a potential Bolton for Hunter Biden swap.

The focus on the Bidens comes as House managers are laying out their arguments for convicting and removing Trump from office based on their two articles of impeachment: One on Trump abusing power in his dealings with Ukraine and another on him obstructing Congress during its investigation of those actions.

At the heart of the impeachment effort is Trump’s decision to delay Ukraine aid, which was eventually released in September, and a July 25 phone call with Ukrainian President Volodymyr Zelensky during which Trump asked him to work with his personal attorney Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE to “look into” the Bidens.

Hunter Biden worked on the board of Burisma while his father served as vice president. In 2016, Joe Biden pushed for the dismissal of Ukrainian prosecutor general Viktor Shokin because of concerns he was overlooking corruption in his own office.

There's no evidence that Joe Biden was acting with his son's interests in mind, the former vice president has denied doing so and the GOP claims have been debunked by fact-checkers.

Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE, the former U.S. envoy to Ukraine, told House lawmakers that Biden "was representing U.S. policy at the time."

Biden's presidential campaign, seeming to anticipate that the former vice president and his son would be a topic of conversation, sent out a memo earlier this week warning reporters against spreading a “malicious and conclusively debunked conspiracy theory” during the impeachment trial.

“Not only is there ‘no evidence’ for Republicans’ main argument against the Vice President — there is a mountain of evidence that actively debunks it. And it is malpractice to ignore that truth,” communications director Kate Bedingfield wrote in a memo to reporters and editors.

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Asked how much they would focus Biden on their defense, Jay Sekulow Jay Alan SekulowNow, we need the election monitors Judge denies Trump's request for a stay on subpoena for tax records Judge throws out Trump effort to block subpoena for tax returns MORE, Trump’s personal lawyer, declined to say but that the House managers “kind of opened the door to that response.”

Some Democrats predicted that House managers were trying to get ahead of Trump’s team, which is likely to focus on the Bidens based on the legal brief the White House filed at the outset of the trial.

“I think they are preempting the arguments by the president's counsel,” Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) said, asked if they were spending too much time on the allegations. “I think that’s important, because when we receive the president’s counsels’ presentation on Saturday, we will have these rebuttals already in our minds.”