The incident happened on Friday afternoon. The man was engulfed in flames and was later taken to hospital, Xinhua news agency reported.

According to reports, the man threw pamphlets in the air and poured accelerant on himself.

According to a New York Post report, the headline of a flyer left at the scene read, "I set myself on fire outside the Trump trial."

The motivation behind the man's actions was unclear.

Last Monday, Trump appeared in a criminal court in Manhattan, New York City in the hush money case, making him the first former US president to stand trial in a criminal case. The trial is expected to last about six to eight weeks.