How long will the Kamala Harris honeymoon in the polls against Donald Trump last?

It is back to being a margin-of-error race for the White House.

Former President Trump saw his edge over President Biden expand in the wake of last month's disastrous debate performance by Biden, as calls grew louder from within his own party for the president to drop out of the race.

However, in the eight days since Biden ended his re-election bid, and Vice President Kamala Harris quickly consolidated party support and became the Democrats' presumptive 2024 nominee, polls indicate it is once again a margin-of-error race.

More importantly, it is all tied up again in the battleground states that will likely decide the outcome of the presidential election. Fox News polls conducted after Biden's blockbuster announcement in three of the seven crucial states - Michigan, Pennsylvania, and Wisconsin - indicated Trump and Harris all knotted up.

WHAT THE LATEST FOX NEWS POLLING IN THE KEY BATTLEGROUNDS SHOWS

Additionally, in Minnesota and New Hampshire - where Republicans have not won a presidential election in decades, but recent polls indicated Trump was very competitive with Biden - the latest surveys indicate the Democrats re-establishing single digit leads with Harris at the top of the ticket.

2024 SHOWDOWN: TRUMP QUICKLY MOVES TO TRY AND DEFINE HARRIS

Veteran GOP pollster Tony Fabrizio, who polls for the Trump campaign, predicted it last Tuesday as he pointed to what he called the "Harris Honeymoon."

"We will start to see public polling – particularly national public polls – where Harris is gaining on or even leading President Trump," Fabrizio wrote in a campaign memo.

"The Democrats and the MSM [main stream media] will try and tout these polls as proof that the race has changed. But the fundamentals of the race stay the same.