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JFK assassination files

The federal government released 2,800 long-secret documents related to the assassination of President John F. Kennedy this week. President Trump blocked the release of some other documents due to what the White House called potential national security concerns. University of Virginia professor Larry Sabato is an expert on JFK's assassination and authored the 2013 book "The Kennedy Half-Century. He joins "CBS This Morning: Saturday" from Virginia to discuss the most interesting new information in the files.

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Border wall threatens mountain ecosystem

In the final weeks of the Trump administration, the rush to complete the border wall is no more challenging than in the Sierra Madre, a mountainous corner where Arizona and New Mexico meet Mexico. However, along with its intent to stop people, the wall there would also stop rare animals who go back and forth from Mexico to the U.S. in the north where there is more water for them to drink. Michelle Miller explores the area, and speaks to conservationists about the importance of preserving the area's biodiversity.

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