democrats are set to hold their national convention later this year. our chief white house correspondented henry live at the white house on the north lawn with an update. what is going on? reporter: we have new information. as you know the president said in december of 2010 that he was evolving on this issue. we are getting new information now suggesting that he is ready perhaps to complete that evolution. i just spoke tow a source close to the president, a democratic adviser, outside the white house who told me the president is expected to go further than he ever has before on this issue. the venue is going to be a last-minute interview at the white house granted to abc news, robin roberts. it s happening at 1:30p ph-rbs eastern time at the white house, moments away. this democratic source told me flat lee, quote the president will make some news. he wouldn t schedule a last minute interview to double down on an old position. i want to caution that i ve talked to two other sources c