Monsanto has long worked to bully scientists" and suppress evidence of the cancer risks of its popular weedkiller, a lawyer argued on Monday in a landmark lawsuit against the global chemical corporation. "Monsanto has specifically gone out of its way to bully ... and to fight independent researchers," said the attorney Brent Wisner, who presented internal Monsanto emails that he said showed how the agrochemical company rejected critical research and expert warnings over the years while pursuing and helping to write favorable analyses of their products. Wisner ... is representing DeWayne Johnson, known also as Lee, a California man whose cancer has spread through his body. The father of three ... is the first person to take Monsanto to trial over allegations that the chemical sold under the Roundup brand is linked to cancer. Thousands have made similar legal claims across the US. The suit centers on glyphosate ... which Monsanto began marketing as Roundup in 1974, presenting it as a technological breakthrough that could kill almost every weed without harming humans. Studies have suggested otherwise, and in 2015, the World Health Organization's international agency for research on cancer (IARC) classified glyphosate as "probably carcinogenic to humans". Glyphosate has been found in food, a variety of water sources, and the urine of agricultural workers. A number of countries have policies banning or restricting the sale and use of glyphosate.