Vice President Kamala Harris' upstart campaign for the presidency is being closely watched for any indications of who she might choose as her running mate and when that choice will be announced.

There are now evident signs that Harris will pick a sitting governor to be her vice presidential nominee and that her decision will be revealed early next week, according to the New York Post.

That speculation stems from reports that the campaign is urging some donors to make contributions before the weekend is over, which some have interpreted as a move to avoid certain federal restrictions on donations when elected state officials, such as governors, are involved in a federal campaign.

Cited financial services employees rule for donations suggests sitting governor could be VP choice

Axios reported Wednesday that unnamed sources in the financial sector claimed that the Harris campaign has cited a particular campaign finance rule in urging Wall Street donors to make any planned contributions as soon as possible, before that rule comes into play.

The outlet noted that the federal Securities and Exchange Commission has a strict rule that limits donations from financial services employees to state officials running for office, ostensibly to prevent so-called "pay-to-play" influence-buying schemes.

The rule applies to both state-level and federal races, and would include a sitting governor running to be the vice president, which is what occurred in the 2016 race when then-Indiana Gov. Mike Pence joined the Republican ticket as the running mate for future President Donald Trump.

Given the reported urgency of the Harris campaign's message to prospective donors to make their contributions before next week, it has been surmised that Harris is getting ready to announce that she has picked a sitting Democratic governor to be her sidekick in the 2024 race.

Three governors said to be on Harris' shortlist of VP contenders

According to the Post, recent media reports have indicated that the Harris campaign has narrowed its list of possible VP picks to Govs. Josh Shapiro of Pennsylvania, Andy Beshear of Kentucky, and Tim Walz of Minnesota, for whom the SEC rule would apply once that pick is announced.

Yet, there also remains speculation that Harris could choose a running mate from a pair of non-governors said to be under consideration -- Sen. Mark Kelly of Arizona and Transportation Sec. Pete Buttigieg, for whom the SEC rule would not kick in.

Of course, the campaign has stridently refused to drop any hints or confirm any speculation and instead has insisted that no choice has been made yet and no updates will be given until the selection is formally announced -- whenever that may be.

Strong indications Pennsylvania Gov. Shapiro will be Harris' choice

However, Politico reported this week on strong indications that VP Harris will choose Pennsylvania Gov. Shapiro to fill her current role, if she wins November's election.

That speculation is based on the campaign's announcement of its rally schedule for next week that will include seven swing states over four days, for which she will be joined by her running mate and is scheduled to kick off in Philadelphia before hitting Wisconsin, Michigan, North Carolina, Georgia, Arizona, and Nevada.

"If Harris chooses Shapiro as her running mate, Philadelphia would make an obvious place to roll out the news, given that he hails from the area’s suburbs," the outlet observed. "But it’s also a diverse, vote-rich city that every presidential nominee must tend to thanks to the state’s 19 electoral votes, and it’s possible Harris’ plans don’t signal anything beyond that."

For his part, Shapiro has refused to confirm or deny reports that he's been vetted by the campaign, and said only of the VP search, "The vice president has a very deeply personal decision to make right now: who she wants to run with, who she wants to govern with, and who can be by her side when she has to make the toughest decisions for the American people. I trust she will make that decision on her own terms when she is ready."