US President Donald Trump on Thursday cast doubt on Joe Biden's mental capacity for a successful primary campaign as the seasoned Democrat became the latest to join the 2020 race for the White House.
"Welcome to the race Sleepy Joe. I only hope you have the intelligence, long in doubt, to wage a successful primary campaign," Trump said on Twitter.
"It will be nasty - you will be dealing with people who truly have some very sick & demented ideas.
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