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No prominent Democrats have called for Biden to step aside, and party leaders have rallied around him in the wake of the report that questioned his mental faculties.
Biden's team has been taking steps to prevent him from falling and tripping, as his age is a top concern for voters.
Biden actually visited Ground Zero for the first time nine days after the attacks.
The incident marks one of several where Biden has been captured stumbling while boarding the presidential plane.
The new preventive measure was implemented after Biden took a hard fall on stage at an Air Force graduation ceremony last month.