NEW DELHI: As the standoff over the Indo-US nuclear deal between the Left parties and the government continued, RJD chief Lalu Prasad on Tuesday met Congress President Sonia Gandhi here. Prasad refused to talk to journalists waiting outside Gandhi's residence after the short meeting. The meeting came in the backdrop of reports that the Railway Minister was in touch with the Samajwadi Party for backing the UPA in case the Left parties withdrew support to the government in the event of forward movement on the nuclear deal.