US President Donald Trump will defy the risk of triggering a coronavirus outbreak at his first re-election rally in months on Saturday (today), hoping the controversial Oklahoma event will instead reignite his misfiring campaign.

The stakes could not be higher -- both for the health of the 19,000 people spending several hours at the indoor arena in Tulsa and Trump's political fortunes five months before an election in which he is currently far behind in the polls.

"My campaign hasn't started yet. It starts on Saturday night in Oklahoma!" the Republican tweeted Friday.

This will be the first of Trump's signature rallies -- formerly a regular event throughout his presidency -- since March 2, when the country went into lockdown to try to curb the spread of the novel coronavirus.

The virus has since killed nearly 120,000 Americans and caused huge disruption to a once-booming economy -- which had been Trump's strongest reelection selling point.

For Trump and his supporters -- the "Make America Great Again" crowd that he hopes will turn out in big numbers to vote in key battleground states -- Tulsa is now the place to show their strength.

"This is a super important moment for all of us," said Stephen Corley, 19, who had been camping outside the arena since Tuesday to be sure he would get in.

"We all have a common purpose and a common goal here," he said. "It's a once in a lifetime opportunity."

- Red state -
Oklahoma is so overwhelmingly Republican that Trump's job isn't to win over the locals -- it's to revive his campaign, which has been rocked by unhappiness over his handling of the pandemic and weeks of racial tensions.

Some of the flak, of course, comes from presidential challenger Joe Biden and other Democrats, but painful blows have also come from a handful of fellow Republicans expressing outrage at what they see as Trump's refusal to unify the country.

The latest and most stinging critique came this week from former national security advisor John Bolton, ahead of the release of his book "The Room Where it Happened," in which the ex-aide describes Trump as ignorant and corrupt.

With polls showing him far behind Biden, a man he disparages as "Sleepy Joe," Trump is eager to change the narrative.

And rallies have long been his favorite political tool.

- Viral danger -
But while Trump rolls the political dice, the crowd and what officials say could be tens of thousands of Trump supporters and anti-Trump protesters outside will be gambling with the risk of contracting the coronavirus.

On Friday, the state's Supreme Court ruled against a lawsuit seeking to halt the rally over health concerns.

"We are confident that we can operate safely in Tulsa," White House press secretary Kayleigh McEnany said.

Local infection rates are rising in Oklahoma. But she noted that the rally organizers will provide everyone with hand sanitizer, a temperature check and an optional mask. 

"We're confident that we can do this safely and we very much look forward to going to Oklahoma," she said.

The government's top infectious diseases expert, Anthony Fauci, was far more cautious, telling CBS radio that "it's very clear that the risk exists."

To attend, Trump supporters must sign a waiver, protecting the organizers from any responsibility.

Democratic Senator Bernie Sanders accused Trump of being "willing to spread the COVID-19 virus in order to hear some cheers."

Trump himself has been adamant about not being seen in a mask and for weeks has insisted that the virus is disappearing, allowing the economy to open back up.

Given his example, there may be many in the tightly-packed arena who decline to wear a mask, as recommended by government health agencies.

Jody, a Trump supporter who did not want to give her last name, lined up early with her five-year-old son Aaron, dressed to look like a mini-Trump.

She said she'd be one of those in a mask.

"We know six people that have been sick from COVID-19, so absolutely," she said. 

"I wish people would wear them, but you can't force people to do something they don't want to do."

Prosecutor who probed Trump allies refuses to quit

A US prosecutor who investigated allies of President Donald Trump insisted Friday he had no intention of quitting after the attorney general issued a press release announcing his resignation.

Geoffrey Berman oversaw the prosecution of former Trump lawyer Michael Cohen and probed advisor Rudy Giuliani's efforts to discredit the president's political opponents since he was appointed to head the powerful Southern District of New York attorney's office in 2018. 

He also investigated two associates of Giuliani accused of campaign finance violations and helping dig up dirt on Trump's election challenger Joe Biden, which became the subject of an impeachment inquiry into the president.

Attorney General William Barr announced Berman's resignation late on Friday and said Trump would nominate Securities and Exchange Commission chief Jay Clayton as his replacement.

"I thank Geoffrey Berman, who is stepping down after two-and-a-half years of service as United States Attorney for the Southern District of New York," Barr said.

But Berman said he first learned of his apparent departure from Barr's press release.

"I have not resigned, and have no intention of resigning," Berman wrote. 

"I will step down when a presidentially appointed nominee is confirmed by the Senate. Until then, our investigations will move forward without interruption."

Top Senate Democrat Chuck Schumer expressed concern over the attempt to fire Berman.

"This late Friday night dismissal reeks of potential corruption of the legal process," he said in a statement.

"What is angering President Trump? A previous action by this U.S. Attorney or one that is ongoing?"

The Trump administration has fired several officials tasked with government oversight.

State Department inspector general Steve Linick was removed from his position last month after running a misconduct probe into Washington's top diplomat and steadfast Trump ally Mike Pompeo.

Berman's predecessor in the attorney's office, Preet Bharara, was sacked after he refused Trump's demand for his resignation.

"Why does a president get rid of his own hand-picked US Attorney in SDNY on a Friday night, less than 5 months before the election?" Bharara tweeted.