Look it up, it’s easy to find examples.
>The media, the intelligence community, and most experts have treated the dossier with caution due to its unverified allegations, while Trump has denounced it as fake news...Some aspects of the dossier have been corroborated, in particular its main allegations that Putin and Russia actively favored Trump over Clinton and that many Trump campaign officials and associates had multiple secret contacts with Russians. However, many allegations in the dossier remain unverified. One allegation against Michael Cohen was dismissed by the Mueller Report, a court ruled that another of the claims was "inaccurate and misleading" and stated another claim was inaccurate. Goldman and Savage have described it as "deeply flawed". The Daily Telegraph has reported that anonymous sources believe Russian intelligence agencies may have sought to create doubt about the veracity of the dossier.