An oppressive heat wave and large planned demonstrations are expected to greet attendees Monday as the Democratic National Convention gets underway in Philadelphia.

Attempts at portraying unity have been fractured with the email revelation suggesting the party favored Hillary Clinton during the primaries. Debbie Wasserman Schultz resigned Sunday as Democratic Party chair.

The city is preparing for much bigger demonstrations than the Republican convention last week in Cleveland, and much higher temperatures. It could be 100 degrees today with a heat index of 108.

In one of the largest rallies planned for the day, a pro-Bernie Sanders group is expected to walk across the Ben Franklin Bridge, which connects Camden, New Jersey, and Philadelphia.

The demonstrations, largely driven by Sanders supporters, have been peaceful, so far.

Volunteers will be handing out water to demonstrators all week.