Absconding Manvir Singh Tewatia is proving to be the biggest stumbling block in the Uttar Pradesh Government’s attempt to control the farmers’ agitation in Gautam Budh Nagar district as political support swelled for him, with former BJP president Rajnath Singh, Samajwadi Party leader Shivpal Singh Yadav, Janata Dal (United) leader Sharad Yadav and CPM leader Brinda Karat jumping to the support of the agitating farmers.