WASHINGTON (AP) — President Donald Trump has ordered an investigation into pardons and other executive actions issued by his predecessor, Joe Biden — launching an extraordinary effort to show that the Democrat hid his cognitive decline and was otherwise too mentally impaired to do the job.

Trump, who turns 79 this month, has long questioned the mental acuity and physical stamina of Biden, and is now directing his administration to use governmental investigative powers to try and back up those assertions. Biden, 82, and now undergoing treatment for prostate cancer, dismissed Trump's actions as “ridiculous.”

Here's a look at what Trump is alleging, what impact it could have, and why the country may never have seen anything like this before.

What did Trump order?

Trump directed his White

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