Donald Trump has yet to divulge his VP pick, despite parading short-list contender U.S. Sen. Marco Rubio before the MAGA faithful gathered in the summer heat at the president’s golf club in Doral, Fla., Tuesday night.

Aside from guessing it will almost certainly not be former Vice President Mike Pence, exactly who will stand second in line to the Oval Office should the 45th President become the 47th is a mystery to everyone, except apparently Trump himself.

“Anyone telling you they know who or when President Trump will choose his VP is lying unless that person is named Donald J. Trump,” Trump adviser Brian Hughes said in a statement.

The list of potential candidates is said to include Rubio, South Dakota Gov. Doug Burgum, and Ohio’s U.S. Sen. J.D. Vance.

Trump told Fox News’ Sean Hannity, in an interview that aired Monday, that he hadn’t yet made up his mind, and then teased but did not make the announcement on Tuesday, saying Rubio “may or may not” be in the Senate to vote for his “not tax on tips” plan next year.

He told the same network’s Brian Kilmeade, on Wednesday, that his announcement likely will not come until the end of this week, just before the Republican National Convention starts on Monday in Milwaukee, Wisconsin.

The former commander-in-chief did say that he likes Vance’s beard (“young Abraham Lincoln”), that Burgum’s stance on abortion is perhaps too strict for electability’s sake (“it’s an issue”), and that Rubio’s Florida residency, when paired with his, puts them at electoral risk due to a quirk in the rules outlined for the delegates selecting the party nominees contained in Article II of the U.S. Constitution (“makes it more complicated”).

Despite weeks of teasing that his decision might come any moment, Trump still has plenty of time to narrow his options.

U.S. Sen. John McCain, the party’s presumptive nominee in 2008, did not announce then-Alaska Gov. Sarah Palin would join the ticket until August 29, with the nominating vote held five days later. If Trump announced before the weekend that would put him just a few days later than McCain as far as timing goes.

Trump’s announcement he would select Pence in 2016 came about four or five days before the party convention, depending on when you mark the beginning of their now-ended political relationship — by the date of the Trump’s Tweet on the matter or the news leak that came the day before it.

The former reality TV star, ever the expert showman, also indicated that this year he might even wait until the convention to make the announcement. That’s how Teddy Roosevelt, Harry Truman, Lyndon Johnson, and George Bush the elder got their VP jobs, and they all were eventually elected as president. Bush’s VP, Dan Quayle, was also nominated at convention but later lost to Bush the younger in the 2000 primary.

“It used to be picked during the convention,” Trump said. “It made the convention, frankly, more interesting. The pick used to be during the convention — that’s what I’d like to do.”

Herald wire services contributed.