street artist robert vargas is using a 60,000 square foot side of a building as his canvas. why?abc's elizabeth vargas. >> so many things can go wrong up here. so i have to be very, very focused and very, very sharp. >> reporter: at the corner of fifth and hill streets in downtown los angeles, something unprecedented is happening. suspended high on a scaffold with his cans of paint and an array of brushes, a single artist is trying to do something no one has ever done before. >> we want for it to be the biggest record. >> reporter: robert vargas. no relation. he's been working every day to have three months painting the largest mural in the world by a single artist. >> i'm going through tons of brushes. >> reporter: each morning on his way to try and set the guinness world record, he greets the denizens of this gritty block. many of whom have spent weeks watching him work painting the 60,000 square foot creation he calls angeles. >> how big a brush do you use? >> sometimes a broom. >> a broom? >> a broom. >> reporter: he has spent hundreds of hours alone on his scaffold with his

robert vargas es hijo de americanos e indÍgenas americanos y es posible que pase al libro de rÉcord guinness

roberts and grateful for only a month left. >> i was there. >> christian fisher there at the end. >> i was there. and vega from vargac said she was -- abc said she was thankful for the first amendment. especially the first amendment. >> has it changed sarah huckabee sanders and the white house press and their interaction, obviously transparency. we know everything the president is thinking from his twitter feed. what about the white house interaction? >> i think -- i think that -- i think sarah huckabee sanders has a good relationship with the press. it is adversarial as most press secretaries have. i think she's established herself. she gets respect. i actually think it is a bit of an improvement over the shaun spicer regime. but i think there's still the underlying hostility and look as long as those press briefings are going to be televised which i think they shouldn't or maybe just the first five minutes, you're going to have this -- the president is going to be used as a foil and many reporters are going to try to grandstand and get their moment on the camera. >> the sarah regime brought it back to on camera. >