By Joe Marino , Chris Nesi and Caitlin McCormack

The Secret Service was warned about Thomas Matthew Crooks and designated him as a “threat” 10 minutes before former President Donald Trump took the stage, but allowed him to go on anyway, law enforcement sources told The Post.

The agency was also warned that there was a “character of suspicion” on the grounds more than an hour before Saturday’s deadly shooting at Trump’s campaign rally in Butler, Pennsylvania, sources said.

Fox News first reported the new details, which emerged during a stunning Senate briefing by the Secret Service on Wednesday.

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