WASHINGTON, United States (AFP) — Donald Trump’s return to the debate stage has media organizations grappling once more with how to cover his frequent distortions of the truth.

Several fact-checking operations say they have been preparing for weeks ahead of the Republican’s face-off Tuesday against Vice President Kamala Harris, their only debate currently scheduled before the 5 November election.

Democrat Harris will also face scrutiny over how she presents her and President Joe Biden’s White House record, as well as her own policy agenda.

CNN faced criticism for not issuing real-time corrections when Trump made a slew of false claims during his June debate against Biden, whose poor performance ultimately led to his exit from the race.

According to the network’s in-house fact-checker, Trump made over 30 such statements, including the baseless claim that Democrat-led states allow babies to be executed after birth.

Outlets including Agence France-Presse (AFP) and The New York Times, meanwhile, devoted outsized resources toward fact-checking the debate — and plan to do so again next week.

The Times focused 29 reporters on fact-checking the June clash — several more than it pulled together for Trump’s first debate in 2016 against Hillary Clinton.

The US fact-checking website PolitiFact also assembled 27 journalists to cover the event, which editor-in-chief Katie Sanders described as its “biggest team ever.”

“We see our highest traffic on debate night, so we go all in with staffing,” Sanders told AFP, adding: “For some voters, this is their only chance to receive fact-checking.”

The nonprofit has been hurrying to screen Harris’ go-to attack lines ever since she entered the race in July, and is also examining which falsehoods Trump is most likely to repeat.

“What looks like live fact-checking on a debate night is actually drawing from days and weeks and months of consistent fact-checking of the candidates,” Sanders said.

Perhaps the biggest challenge is that Trump regularly invents new false or misleading claims in addition to repeating old favorites, like his unfounded assertion of significant fraud in the 2020 election.

“There has never been a presidential candidate like Trump, who has deliberately used lying as a campaign strategy,” Alan Schroeder, professor emeritus at Northeastern University, told AFP.

The Washington Post logged 30,573 false or misleading statements Trump made during his term in the White House.