FILE - In a Wednesday, Nov. 6, 2019 file photo, Senate Majority Leader Mitch McConnell, R-Ky., front, and Attorney General William Barr arrive before President Donald Trump speaks in the East Room of the White House about his judicial appointments, in Washington. McConnell said Kentucky Gov. Matt Bevin “had a good four years” during a visit to a steel plant in Kentucky Monday, Nov. 11, 2019. Bevin ran a close race against Democrat Andy Beshear but is trailing by about 5,000 votes ahead of a re-canvass on Thursday, Nov. 14, 2019. (AP Photo/Manuel Balce Ceneta, File)

FILE - In a Wednesday, Nov. 6, 2019 file photo, Senate Majority Leader Mitch McConnell, R-Ky., front, and Attorney General William Barr arrive before President Donald Trump speaks in the East Room of the White House about his judicial appointments, in Washington. McConnell said Kentucky Gov. Matt Bevin “had a good four years” during a visit to a steel plant in Kentucky Monday, Nov. 11, 2019. Bevin ran a close race against Democrat Andy Beshear but is trailing by about 5,000 votes ahead of a re-canvass on Thursday, Nov. 14, 2019. (AP Photo/Manuel Balce Ceneta, File)

WASHINGTON (AP) — It’s been easy for majority Democrats to keep Republicans from shifting the focus of the House impeachment hearings . Yet GOP leverage to do just that will grow should the battle reach the Republican-run Senate.

If the House votes to impeach President Donald Trump, which seems likely, the Senate would hold a trial on whether to oust him from office, probably early next year.

There, attorneys for Trump, along with Senate Majority Leader Mitch McConnell, R-Ky., or any other senator can call their own witnesses. The big catch is they’d need enough votes from the 53 GOP senators to muster a majority and prevent Democrats from blocking them.

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Assuming Republican senators stay united, which isn’t guaranteed, Trump’s defenders could try refocusing the inquiry by seeking testimony from people like Hunter Biden , son of 2020 Democratic presidential hopeful Joe Biden.

Trump and some Republicans have pushed an unsubstantiated narrative suggesting improprieties by Hunter Biden when he worked for Burisma, a Ukrainian natural gas company, while his father was vice president.

Calling witnesses about that — and another unfounded theory about Ukrainian involvement in the 2016 presidential election — could make life difficult for Joe Biden just as his party’s presidential primary season is beginning.

It would also please the GOP’s core conservative voters, woo some independents and perhaps help any wavering Republican senators stand by Trump on climactic votes over whether to remove him from office.

“What Republicans want to do is broaden the story,” said David Hoppe, who was chief of staff to Senate Majority Leader Trent Lott, R-Miss., during the 1999 impeachment trial of President Bill Clinton.

But calling such witnesses could be viewed as a blatantly political move that overreaches, risking voter backlash in next November’s elections. That might be especially damaging for moderate Republicans facing tough reelections in swing states, where centrist voters could be pivotal.

Sen. Kevin Cramer, R-N.D., said Thursday that he’d like Senate testimony from the still anonymous whistleblower, whose House appearance has been blocked by Democrats.

That person’s complaint about a July telephone call between Trump and Ukrainian President Volodymyr Zelenskiy triggered the impeachment investigation. Many GOP senators have opposed that idea.

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Cramer said he might also like to hear from both Bidens and Rep. Adam Schiff, D-Calif., who’s heading the House Democrats’ impeachment inquiry.

Asked if Republicans might overplay their hands by calling such witnesses, Cramer said: “Sure, it’s possible. I would hope political strategists won’t allow that to necessarily happen.”

McConnell will likely call “real witnesses on both sides of the aisle,” said Scott Reed, senior political strategist for the U.S. Chamber of Commerce and a long-time force in GOP politics. He said McConnell won’t “make this an easy vote for anyone. He’s focused on maintaining the majority” Republicans have in the Senate.

Republicans say McConnell is far from deciding which witnesses would testify and is unlikely to do so until the House completes its hearings, draws up articles of impeachment and votes on them. That seems likely to take the rest of this year, at least.

A major wild card is likely to be the incendiary Trump, who might push his attorneys to pursue testimony from the Bidens or others involved with Burisma or the 2016 election.

“When this goes over to the Senate, you know, the people that actually started this thing, they are going to be put on the stand,” Eric Trump, the president’s middle son, told reporters Thursday. He said that would include “heads of the Democratic Party.”

Such demands would be certain to be opposed by Senate Democrats and would risk causing divisions among Republicans in showdown votes over how the Senate trial will be run.

A White House spokesman did not respond to several messages seeking comment.

McConnell and Senate Minority Leader Chuck Schumer, D-N.Y., have said they seek a compromise on the Senate trial’s procedures. Such a deal could address witnesses, whether they would testify in public and how long the trial would last.

With today’s jagged partisan differences, it’s unclear that a bipartisan pact on a dominating, prickly issue like impeachment is attainable.

McConnell said recently that he’d not yet held talks with Schumer.

“It’s way too premature,” Schumer said Thursday when asked about witnesses.

In Wednesday’s initial impeachment hearing and in previous closed-door, sworn testimony, diplomats and White House officials have testified they believe that to press Ukraine, Trump was delaying U.S. military aid to Kyiv for its grinding war against Russian-backed forces. He was also withholding an Oval Office visit he’d promised to the newly elected Zelenskiy, they said.

House Democrats were intent on limiting witnesses to officials who could address that case. They’ve been blocking GOP requests for witnesses including Hunter Biden, another Burisma official and others who Republicans say gathered dirt on Trump’s 2016 campaign.

But while House Democrats have largely dictated that chamber’s impeachment rules, Senate ground rules would tilt more toward Republicans.

Senate impeachment procedures allow witnesses to be called by the president’s defense lawyers and by a team of House Democrats who will in effect be the prosecutors.

McConnell and any senator can also offer motions to call witnesses. A majority of senators could reject the requests.

In a past example of lawmakers’ sensitivity about witnesses, Lott said he and Democrats agreed during Clinton’s trial that they wouldn’t let Monica Lewinsky testify in the Senate chamber.

Lott said he was concerned that Lewinsky, the White House intern with whom Clinton had an affair, would be asked about her semen-stained blue dress.

“I was willing to blow the place up rather than do that,” Lott recently told The Associated Press.

Her testimony was videotaped privately, and senators viewed excerpts.

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AP reporter Jill Colvin contributed.