A suspected terrorist who allegedly plotted to assassinate Ivanka Trump sported a brazen smirk in Manhattan court Monday as he pleaded not guilty to preparing to bomb a city synagogue.

Mohammad Baqer Saad Dadwood al-Saadi, 32 — who boasted to the feds that he was a close pal of Iran’s late Ayatollah Ali Khamenei — grinned throughout the proceeding and at one point began claiming that all’s fair in war.

“I’m not a criminal. … Our children are being killed by your rockets,” al-Saadi said in Arabic, which was translated by a court interpreter.

“I’m not guilty. … I’m in a war situation,” added the suspect, who allegedly planned to bomb the Big Apple house of worship as part of a global reign of terror that spanned nearly a decade.

Al-Saadi also plotted to kill President Trump’s daughter — and even had a blueprint of her Florida home — sources have told The Post. He has not been charged over those allegations.

The accused terrorist, a leader of the terror group Kata’ib Hizballah with ties to Iran’s Islamic Revolutionary Guard and the terror group Hezbollah, coordinated the bombing of a Bank of New York in Amsterdam, a synagogue in Belgium and the stabbing of two Jewish victims in London, according to authorities.

In all, federal prosecutors said al-Saadi has been linked to 16 planned or executed attacks of international targets in March and April alone.

“Al-Saadi claims to be part of the ‘resistance,’ a group that includes IRGC, an Iran-based designated foreign terror organization,” US Attorney Jay Clayton said in a statement.

“All Americans should recognize that we have sworn enemies and when your enemies tell you something and when they act, you should know that they mean it,” Clayton said.

The feds have not identified the “prominent” synagogue that was targeted but said al-Saadi allegedly paid a person who turned out to be an undercover agent $3,000 of a promised eventual $10,000 to carry out the attack.

The suspect has boasted that he was like a son of Qasem Soleimani, the commander of the IRG who was killed by a US air strike in 2020, and close to Khamenei, huddling with him just three days before the supreme leader was killed by America at the start of its war on Iran.

Al-Saadi was nabbed in Turkey earlier this month and hauled to Manhattan federal court Monday, where he wore a jail-issued tan jumpsuit over an orange shirt, matching orange Crocs and shackles on his feet.

The accused terrorist smiled throughout the hearing, including when the massive list of the charges against him was read aloud in court.

He is facing raps such as conspiring to provide material support to foreign terrorist organizations, conspiring to bomb a place of public use and attempted acts of terrorism transcending national boundaries — with the last two charges carrying sentences of up to life in prison.

A handful of New Yorkers who identified themselves as part of an informal “judicial watch” for the Jewish community attended Monday’s hearing.

“We have eyes on him, and we want justice done,” said a member of the group, Glenn Richter, to The Post.

Al-Saadi is being held in solitary confinement at the federal Metropolitan Detention Center in Brooklyn.