Jenson Button has hit back at Ron Dennis, after the McLaren supremo warned the out-of-contract 2009 world champion to "try harder". Speculation about the 34-year-old's future has intensified since Dennis told British television: "He (Button) is a highly paid grand prix driver, and yes, we're not giving him the best car, but he could do his bit". At the same time, McLaren's new team boss Eric Boullier is making no secret of his discussions with other drivers on the grid -- believed to be Button's fellow champions Fernando Alonso, Sebastian Vettel and Lewis Hamilton. "It's my job to be in touch with the drivers," Boullier told the Telegraph. "Let's say some...
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