"We don’t know where their parents come from," Trump says.
Bush defended Sen. John McCain (R-Ariz.) against Trump's attacks on his military service.
Rubio is fundraising off Saturday's episode.
She's the seventh senator to back the Florida Republican.
"We can’t be soft and weak like our politicians,” Trump said at a Monday rally.
“I don’t think there’s anybody ... who think he’s the most electable now," Christie said.
"If he came looking for a job, you’d say ‘no thank you.'"
Willey, a former White House volunteer, alleges Bill Clinton groped her in 1993.
"It's not comfortable for me to attack Marco Rubio," Bush added.
The former president also attacked the senator's healthcare and campaign finance.