Helen Thomas has died at 92

Helen Thomas (1920-2013) was a pioneering journalist at the White House. She covered the administrations of 10 presidents (from Kennedy to Obama) for nearly five decades. She was the person sitting in the front row at the White house who ended every presidential press conference by saying, on behalf of her fellow journalists, "Thank you, Mr. President”.

She was known for asking difficult questions.

President Obama released a statement saying: “What made Helen the Dean of the White House Press Corps was not the length of her tenure but the fierce belief that our democracy works best when we ask tough questions and hold our leaders to account”.