EXCLUSIVE: ABC’s David Muir Interviews Scott Walker Ahead of Expected Presidential Announcement

The Wisconsin governor will become the 15th Republican to enter the race.

Walker went on to win the 2012 recall election by a wider bargain than he won in 2010, becoming the first governor in U.S. history to overcome a recall election.

He will return to the same place where he declared victory in the 2012 recall election, the Waukesha County Expo Center, for an announcement event at 6 p.m. Monday.