An aging president faces poor poll numbers and suspicions about his health but insists that America is thriving.

Joe Biden? No, it's Donald Trump.

The Republican, back in power for nearly a year, continues to compare himself to his predecessor.

Biden would be senile, while Trump brims with energy; the Democrat would have driven the country into bankruptcy, but the Republican presides over an economic "golden age" - so Trump says.

At a Pennsylvania rally on Tuesday, Trump uttered his rival's name more than 20 times and even called him a "sleepy son of a bitch."

Yet for the past few weeks, a strong sense of deja vu has colored the billionaire's presidency.

Some of his statements, in the unabashed style that is his hallmark, echo remarks made by Biden.

"America has the best economy in

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