US President Donald Trump on Tuesday described his presidential opponent Joe Biden as “the single worst candidate in the history of America”, referring to a few recent gaffes of the Democratic leader.

“I’m running against the single worst candidate in the history of American presidential politics and you know what that does? That puts more pressure on me. Can you imagine if you lose to a guy like this?” Trump told his supporters during his Pennsylvania rally.

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Trump recalled how recently Biden, mid-speech, forgot the name of former Republican presidential candidate Mitt Romney.

“It’s unbelievable. It’s disgusting. It’s disgraceful. If he wins the radical left will be running the country. He won’t be running the country. The radical left will takeover. And how about (that), Pennsylvania? So he says there will be no fracking. No fracking!” the president said.

The president expressed his confidence of winning the eastern swing state in the upcoming election.

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“This election is a simple choice. If Biden wins, China wins. All these other countries win. We get ripped off by everybody. If we win, you win, Pennsylvania wins, and America wins. Very simple,” he said.

Trump also criticised Biden for his views on migrants and troop deployment in the Middle-east. 

Trailing far behind his opponent in national polls, Trump resumed his campaign rallies just a week after getting discharged from hospital and is seeking to rally his base on a blitz of key swing states.