Planned Parenthood and EMILY's List are targeting Sen. Pat Toomey (Pa.).
A spokeswoman for Bush said he would support Rubio.
Rubio missed a Senate Foreign Relations Committee hearing Wednesday morning.
"I'm fully prepared to have the U.S. Senate be the last political job I ever have."
Sen. Joe Manchin has said his due process remarks were taken out of context.
Rubio changed course and announced he would run for reelection Wednesday.
Lisa Hagen 06/22/16 11:20 AM EDT
DeSantis will run for reelection in the House, while Lopez-Cantera will continue as lieutenant...
Rubio has said that he feels compelled to continue in public service after the shootings.
Rubio had insisted he wouldn't run but softened his stance last week.
Rubio has decided to run for reelection.