Donald 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 three-day trip to Scotland is raising questions among Republicans over whether the presumptive GOP presidential nominee's time would be better spent campaigning instead of opening a new luxury resort overseas.

Party members are concerned that Trump's Thursday through Saturday trip is taking away time he could be using to get back on track after sinking poll numbers, dismal May fundraising figures and questions about his campaign following the recent firing of his campaign manager.

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“It’s a strategic mistake,” said Doug Heye, a former Republican National Committee (RNC) aide and GOP strategist.

“This isn’t even his first trip to Scotland during this campaign — he would be better served to spend time in Ohio and in North Carolina and in Virginia, and the other states that will decide this election.”

Sen. John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE, the South Dakota Republican who leads the Senate Republican Conference, shared those concerns with Morning Consult, calling on Trump to “get back here and get on the campaign trail.”

“This sounds like more of a trip to associate with his business interests,” Thune added.

Trump’s campaign hurdles have prompted uneasiness among Republicans, raising the stakes for the next few weeks.

He was criticized for his attacks on a Hispanic federal judge who is presiding over the case against Trump University, and his initial response to the June 12 Orlando mass shooting was panned as self-congratulatory.

His poll numbers have slid to a 6-point gap in RealClearPolitics’s average. And he fired his campaign manager, Corey Lewandowski, on Monday, hours before revealing just $1.3 million in the bank — less money than many House candidates have for their campaigns.

Making campaign trips overseas has long been the practice of presidential candidates looking to shore up their foreign policy credentials and change the narrative.

GOP nominee Mitt Romney touched down in both Europe and Israel in 2012 in the hopes of proving he could serve as the nation’s chief diplomat, despite a lack of foreign policy experience.

Then-Sen. Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE made a similar trip in 2008, as did a handful of Trump’s primary opponents this cycle.

All were filled with a healthy schedule of official meetings meant to show the candidate’s deftness on the international stage.

But while President Obama arrived overseas to praise and throngs of supporters, Romney earned criticism for a string of gaffes, while former GOP presidential candidate Ben Carson raised eyebrows this cycle for praising a Syrian refugee camp as “really quite nice.”

As it stands, Trump has no official plans outside of media availability — the trip is strictly business.

He’ll fly to Scotland on Thursday and hold a press conference on Friday before a ribbon cutting and photo-op at his new golf course and resort on Scotland’s western coast.

Trump’s campaign did not respond to questions about whether any events are planned to help build his foreign policy reputation. He had previously tweeted that he would visit Ireland, too, but his official travel plans make no reference to Ireland, whose prime minister has been a vocal critic of Trump.

“If he were going overseas to do something to burnish his foreign policy credentials, meeting with some of the leaders in Europe who have been critical of him and taking other meetings, that’s one thing,” Heye said.

“Going to a golf course in Scotland is another, and it’s the haphazard approach to this campaign that I think leaves so many scratching their heads,” he said.

He added that Trump is also missing an opportunity to fundraise with Republican Americans living abroad, who are allowed to donate to campaigns.

Republican strategist Ron Bonjean lamented that the shift in priorities won’t allow Trump to take advantage of any momentum gained from his Wednesday speech eviscerating presumptive Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE.

He also worried that the candidate's absence could scare off Republicans and fundraisers who have been wary about supporting Trump.

“After Trump’s speech going after Hillary Clinton, one could imagine him doing a series of rallies across the United States to pound that same speech home in battleground states,” he said.

“When Trump chooses to go to his golf resort in Scotland, it sends a message to the fundraising community as well as Republicans on the fence that he’s not making smart strategic decisions.”

The trip comes at a historic time for the United Kingdom, and one that some Republicans believe Trump can still leverage even without any official meetings.

He’ll touch down in Scotland on the day of the Brexit vote on whether Britain should exit the European Union.

Weighing in on the issue, Trump told London's Sunday Times that he’d “be more inclined to leave, for a lot of reasons, like having a lot less bureaucracy” if he was a British citizen.

But he softened that stance during an interview with Fox Business on Wednesday. “I don’t think anybody should listen to me because I haven’t really focused on it very much.”

Some Republicans believe that, even without any official meetings, just being there will give Trump additional credibility when he likely addresses the issue during his press conference Friday.

“Traveling to Britain allows the Trump campaign to portray foreign policy chops while playing to his domestic base around the vote to leave the European Union,” Vincent Harris, a Republican strategist who worked on Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE’s presidential bid and also advises international political clients, said by email.

“An average voter will just see that he's in Britain and give credit to foreign policy chops. Elites and high-information voters will look for who he met with, but to his base and working class voters, this is a positive trip."

Regardless of how Trump handles Brexit, leaving the campaign trail at this time might be a move that would hurt conventional candidates but might not hurt Trump, said Ambassador Jim Nicholson, who served as RNC chairman during George W. Bush’s first presidential bid.

“During my chairmanship, I always said to all candidates, including Gov. Bush, ‘There is no substitute for hard work and you never get a day back in a campaign,’ ” he said.

“But those are conventional notions that work for me and candidates I helped get elected. Trump is not fitting into this conventional mold and doing extraordinarily well.”