Bernie Sanders is coming to Philadelphia with his mind on the Democratic Party’s future — and his own. Having created a movement campaign that galvanized millions of people, Sanders now finds himself in the unfamiliar role of party power broker as Democrats gather to nominate Hillary Clinton for president. The Sanders campaign had planned to hold an up to 40,000-person rally in Philadelphia on Sunday, but its permit was denied. According to the Philadelphia mayor’s office, Ashburn Field, where the event would have been held, “has not been opened for expressive activity to the general public.” The campaign is keeping a tight lid on the specifics of Monday’s events and won’t say how long the independent senator will stay at the Democratic convention.