NEW YORK CITY -- The future Republican vice presidential candidate's plane is currently parked in an undisclosed hangar, an empty spot on its fuselage where a decal featuring his or her name will soon be placed.

Fundraisers have been planned.

All that's left: an announcement from former U.S. president Donald Trump unveiling his pick.

Senior advisers and longtime allies insist they still don't know whom the presumptive GOP nominee will choose to join him on the ticket 鈥� with many believing the choice is still in flux.

The decision will come at an unprecedented time of upheaval in the presidential race. U.S. President Joe Biden and the Democratic Party continue to grapple with his dismal debate performance and the intensifying calls for the 81-year-old president to step aside in favor of a younger candidate.

The Democrats' crisis has given Trump little incentive to change the subject with a VP announcement that would be sure to draw a flurry of attention and focus.

But Trump will have plenty of opportunities this week to ratchet up the speculation about a process that his team has kept extraordinarily close to the vest.

鈥淚t could happen anytime this week,鈥� Trump senior adviser Jason Miller said in an appearance on Fox News.

Opportunities to announce

Trump has two rallies planned. The first is scheduled for Tuesday evening at his golf club in Doral, Florida, near Miami. The primetime scheduling and location would seem to provide an ideal opportunity to unveil his pick if it is Florida Sen. Marco Rubio, a Miami native who is one of his top contenders.

Rubio will be in attendance at the event, according to an adviser familiar with the senator鈥檚 plans, who, like others, spoke on condition of anonymity about the selection process.

On Saturday Trump will travel to the critical battleground state of Pennsylvania for an afternoon rally at the Butler Farm Show. The venue, outside of Pittsburgh, is not far from the border of Ohio, which is home to Sen. JD Vance, another potential pick.

Also said to be on Trump's short list is North Dakota Gov. Doug Burgum, who has grown close to the former president since he dropped his own bid for the nomination before voting began.

Trump doesn't need a rally to unveil his pick. He could simply announce the news on his Truth Social platform at any moment between now and the Republican National Convention, which kicks off in Milwaukee on July 15. Or he could wait until the convention opens to make a grand, on-stage curtain reveal reminiscent of his days as the host of the 鈥淭he Apprentice" reality TV show.

Trump has repeatedly said he intends to unveil his pick just before or during the convention. But he has been coy about his choice.

Late last month, before the debate, Trump told NBC News at a campaign stop in Philadelphia that he'd already made a decision.

鈥淚n my mind, yeah," he said.

But less than a week later, he told a local Virginia television station that his decision was still in flux.

鈥淲ell I have people in mind. I have so many good people. We have such a deep bench," he said. "But we'll be making a decision sometime early convention or before convention.鈥�

The front-runners say they don't know yet

鈥淎s President Trump has said himself, the top criteria in selecting a Vice President is a strong leader who could make a great President," Trump adviser Brian Hughes said in a statement he has issued repeatedly. 鈥淏ut anyone telling you they know who or when President Trump will choose his VP is lying unless that person is named Donald J. Trump.鈥�

That includes the front-runners for the job.

On CNN's 鈥淪tate of the Union鈥� on Sunday, Rubio said he remained in the dark.

鈥淟ook, I鈥檝e heard nothing, I know nothing, and you probably know more than I do about it,鈥� he said. 鈥淒onald Trump has a decision to make. He鈥檒l make it when he needs to make it. He鈥檒l make a good decision. I know for certain that I will be out there over the next three or four months, working on behalf of his campaign in some capacity.鈥�

He also dismissed questions about whether he has discussed changing his residence from Florida if he鈥檚 chosen as 鈥減resumptuous.鈥� The Constitution bars the president and vice president from hailing from the same state.

"We鈥檒l confront those issues when they come," he said. "But we鈥檙e not there yet. But we will be soon, one way or the other.鈥�

On NBC's 鈥淢eet the Press,鈥� Vance, too, said he has not received news one way or the other: 鈥淚 have not gotten the call."

鈥淏ut most importantly," he went on, 鈥漺e鈥檙e just trying to work to elect Donald Trump. Whoever his vice president is 鈥� he鈥檚 got a lot of good people he could choose from 鈥� it鈥檚 the policies that worked and the leadership style that worked for the American people. I think we have to bring that back to the White House, and I鈥檓 fighting to try to do that."

A top ally is still pushing for Tim Scott

On CBS's 鈥淔ace the Nation," Sen. Lindsey Graham, a longtime Trump ally, continued to push for his fellow South Carolinian, Sen. Tim Scott, the only Black Republican in the Senate.

鈥淚 don鈥檛 think he鈥檚 decided,鈥� he said, again making his case for Scott, who he said would be a particularly smart choice if Biden were to be replaced at the top of the ticket by Vice President Kamala Harris, the first Black woman and person of South Asian descent to serve in the office.

If Harris is picked, Graham said, 鈥淭his is a dramatically different race than it is right now today. I hope people are thinking about that on our side.鈥�

Biden has insisted he won't drop out and said only 鈥� the Lord Almighty 鈥� could get him to change his mind.

Graham commended Trump's other choices at the same time. He called Burgum 鈥渟olid as a rock" and said Vance 鈥渃ould be a good wingman,鈥� but questioned whether the Republican firebrand 鈥� who was once a vocal Trump critic but is now one of his fiercest defenders in the Senate 鈥� could bring in new states.

Rubio, he noted, has the issue of his residency to contend with, but called him a 鈥渧ery articulate conservative鈥� who could help Trump "enormously.鈥� Rubio, the son of Cuban immigrants, also speaks Spanish.

鈥淚f I were President Trump, I would make sure I pick somebody that could add value in 2024. Expand the map,鈥� Graham said.

Associated Press writers Steve Peoples and Michelle L. Price contributed to this report.