“Two suspicious packages were discovered at a Pentagon mail facility Monday, the Associated Press reports. Then, this evening, the Secret Service announced that another envelope addressed to President Donald Trump was intercepted before it got inside the White House.

“There’s no word yet about what might have been tainting the president’s mail — but an unnamed federal official said that early tests detected ricin in the Pentagon packages, NBC Washington reports.

“It might not be ricin — after all, it takes a day or two for the FBI to fully run its tests.

“But ricin is an oddly popular choice for attempting to poison presidents.

“A man from Mississippi and a woman from Texas, for example, were sentenced to prison for mailing ricin-filled letters to President Obama, among others. President George W. Bush apparently got his own ricin letter, too.”

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