Stocks are moving higher to start Tuesday's trading session, and Kevin Green wants to see markets broaden to have more confidence the uptrend will sustain. However, any breakdown in talks between the U.S. and Iran will lead to a spike in crude oil prices and a downslide in equities. KG adds that investors saw a "pretty good" morning when it came to the latest economic data. All eyes are on the FOMC as well with incoming Fed Chair Kevin Warsh's confirmation hearing underway.