Democratic presidential candidate Julian Castro has denied his attack on Joe Biden in a Democratic debate was a veiled jab at his mental faculties.
Three times on Thursday night, Mr Castro accused Mr Biden of "forgetting what you said two minutes ago".
But following the debate in Houston, Texas, Mr Castro denied to the BBC that he was going after Mr Biden's age.
A political fact-checker ruled that Mr Castro was actually himself incorrect about Mr Biden's remarks.
Few candidates have been willing to directly broach the age of 76-year-old Mr Biden, who has made repeated gaffes and ...
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