The co-founders of a political research firm behind allegations about President Trump’s ties to Russia have a book coming out next month.

Random House announced Monday that “Crime in Progress: Inside the Steele Dossier and the Fusion GPS Investigation of Donald Trump” will be published Nov. 26.

The book was co-written by Fusion GPS founders Glenn Simpson and Peter Fritsch.

Random House called “Crime in Progress” a “never-before-told inside story” about Trump and Russia and the investigation into whether his campaign colluded with Russia during the 2016 election.

Fusion GPS helped compile the so-called Steele Dossier, by former British spy and Russia expert Christopher Steele, who in his findings contended that the Russian government may have compromising information on Trump.

In his tweets, the president has attacked the dossier as “FAKE.”

Special counsel Robert Mueller concluded that there was insufficient evidence to charge the president with collusion with Russia, but he did not rule out obstruction of justice.

“If we had had confidence that the president clearly did not commit a crime, we would have said so,” Mueller said in May.

With Post wires