Elaine Tappin spoke to reporters after she appeared before the Home Affairs Select Committee to talk about her husband Christopher Tappin's extradition.
She said he was very worried about him and his mental health.
Asked by a reporter if she had a message for President Obama and the US, Mrs Tappin said:
"Please be kind to him, don't treat him unjustly, and let him have his day in court quickly so he can come home to us."
More top news
A court has ruled that the original coffin in which Lee Harvey Oswald was buried belongs to his brother, not the undertaker's that sold it.
Manic Street Preachers lyricist went missing nearly 20 years ago but mystery still surrounds exactly what happened to him.
Deputy Prime Minister admitted he wanted to hit David Cameron on more than 20 occasions on late-night chat show 'The Last Leg'.