The Texas senator is speaking Monday at Liberty University.
"I think the pressure for Warren to get in will mount," Morris said.
The potential 2016 presidential field is a long list full of long shots.
Get ready for the largest Republican presidential field in recent history.
Walker will speak to the Arizona Chamber of Commerce on Wednesday.
"I think it's unconscionable that Hillary Clinton is accepting donations from them."
Reporters are being urged to attend Monday's speech at Liberty University.
Democrats narrowly topped the GOP in fundraising last month, $5.2 million to $5 million.
The DSCC is seeking to win back five Senate seats to retake the upper chamber.