Republican presidential candidate Donald Trump posted a quote on a social network site attributing it to Mahatma Gandhi.
However the US media said there is no proof that the Indian leader had ever said such thing.
"First they ignore you. Then they laugh at you, then they fight you, then you win - Mahatma Gandhi," Trump wrote on social networking site Instagram as part of his effort to rally supporters.
The post included a picture of hordes of supporters rallying at a Trump campaign stop in Alabama.
Soon, the anti-Trump lobby was up in flames on the social media.
The Hill, a top website, said, "There's no record that Gandhi ever used the phrase, which has been widely attributed to him."
It said, the quotation seems to be similar to words used in a 1918 trade union address by socialist leader Nicholas Klein.