Trump Jr served with hilarious reminders of his dad’s awkwardness as his attempt to mock Bernie Sanders backfires

President Donald Trump's eldest son tried to mock Sen. Bernie Sanders' physical prowess -- but his attack backfired.

The Vermont senator and Democratic presidential candidate took a swing at a speed bag this week the Muhammad Ali Center in Louisville, Kentucky, but the 77-year-old got hit in the face by the bag -- and took a comically exaggerated step back before taking a couple more jabs.

Donald Trump Jr. used a video of the stunt in an attempt to mock Sanders as weak.

But other Twitter users pointed out the president and his son's physical blunders and general awkwardness.