The man, whose name has not yet been released by authorities, self-immolated in front of the Israeli embassy on Sunday shouting “Free Palestine", a news website reported.
According to the Metropolitan Police Department in Washington, the man was taken to a hospital with life-threatening injuries.
The members of the Secret Service subdued the man in Air Force uniform before the arrival of emergency responders.
In December, a protester self-immolated in front of the Israeli consulate in Atlanta.
The embassy has been the site of sustained protests against the Israeli genocidal war on Gaza.
Americans have held several massive rallies in major cities in solidarity with Palestinians while demanding their government to stop aid to Israel and press the regime to end its bloodshed of Palestinians.