Pennsylvania’s lieutenant governor and Democratic U.S. Senate candidate John Fetterman predicted Monday that his Republican rival Dr. Mehmet Oz will take an early lead in their contest as returns come in on Election Day.

However, he said that a “dramatic” change would happen overnight as more ballots are processed.

“Counting for ballots cast by mail and early in-person cannot begin until Election Day, thanks to the GOP-controlled legislature — an intentional move to help Republicans baselessly sow doubt about the election results when it suits them,” Fetterman wrote in a memo to “interested parties,” The Washington Post reported.

“Pennsylvania is one of only eight states that bans pre-processing of early mail-in ballots, forcing county officials to wait until 7 a.m. on Tuesday to begin opening returned ballots and scanning them into the system,” he added.

Fetterman pointed to the 1.4 million mail-in ballots requested, saying they will skew heavily Democratic when counted.