The race for the White House is once again being dominated by an issue that appeared long-settled: Hillary Clinton’s email server.

The FBI’s disclosure on Friday that investigators had found emails possibly linked to Clinton’s server on a computer belonging to an aide shook up the presidential campaign.

On Monday, the Justice Department said it would move as quickly as possible to get this investigation completed – or at least to offer the public more information.

In the meantime, the Trump campaign is seizing on the FBI’s action to try to generate some late momentum.

Donald Trump’s campaign hopes the FBI’s Friday announcement can help them unlock new battleground states.

On Monday, Trump hammered on Hillary Clinton in reliably Democratic Michigan.

"This is the biggest scandal since Watergate. Hillary wants to blame everyone else for her mounting legal troubles. But she has brought all of this on herself," said Trump.

Trump’s foray into the Great Lake state comes as both campaigns try to keep open as many paths to 270 electoral votes as possible. Clinton’s campaign now aggressively targeting deep Red Arizona, too.

Clinton’s campaign spent the weekend demanding more information from FBI director James Comey, whose cryptic letter to congress on Friday has been followed by a host of leaks – but no further official statement from the FBI.

In Ohio on Monday, Clinton addressed the email issue directly, hoping to put it behind her.

"As I’ve said, I’m not making excuses. I’ve said it was a mistake and I regret it. And now they apparently want to look at emails of one of my staffers, and by all means they should look at them. And I am sure that they will reach the same conclusion they did when they looked at my emails for the last year. There is no case there," said Clinton.

Early polling shows that the FBI disclosure hasn’t moved the race in any significant way so far. Republican operatives said they don’t think it will change the trajectory of the race, which favors Clinton, but it could help the GOP save their senate majority by stopping any Democratic momentum in this race’s last week.

A White House spokesman said the President would stay out of this issue, and that he still respects Comey as a “man of integrity.”