The FBI had multiple “missed opportunities” to stop Thomas Crooks before he tried to assassinate President Trump, a former assistant director at the Bureau has told The Post.

Last week, The Post reported on multiple extremist social media posts believed to be tied to Crooks, including numerous threats of political violence and a dramatic shift against Trump, after previously expressing his admiration for the Republican.

If even “half” of Trump’s would-be assassin’s extremist digital footprint turns out to be true, he should have been on the FBI’s radar long before the 20-year-old opened fired on the then-presumptive GOP presidential nominee during a rally in Butler, Pennsylvania, said Chris Swecker, a retired FBI assistant director.

“It’s clear that he was popping off on the social me

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