Democratic presidential candidate Sen. Bernie Sanders (I-VT) predicted Sunday that there would be a “contested contest” at the Democratic National Convention in the summer, The Hill reported.

Sanders said at a news conference in Washington that his opponent, Hillary Clinton, wouldn’t have enough delegates by the summer convention.

“She will need superdelegates to take her over the top. The convention will be a contested contest,” Sanders said.

The candidates will next face off Tuesday in the Indiana primary.

“There are 10 states remaining where we are going to be vigorously competing, plus the District of Columbia, Puerto Rico, the Virgin Islands and Guam,” Sanders said.