He gets 42 percent of the debate conversation, followed by Jeb Bush, with 23 percent.
The two are competing for a lane out of South Carolina.
“Jeb is so wrong, just so you understand,” Trump responded to loud booing by the crowd.
"The World Trade Center went down during the reign of George Bush. He kept us safe?"
Trump was booed for attacking former President George W. Bush.
Ben Kamisar 02/13/16 09:47 PM EST
Rubio argues the nomination for the late justice's successor should be delayed.
"Obviously the war in Iraq was a big, fat mistake," Trump said.
The two quarreled over whether a high court justice had been appointed in an election year.
Trump called on Senate Majority Leader Mitch McConnell (R-Ky.) to block any nomination.
CBS News avoided any awkward moments Saturday to kick off the latest Republican presidential debate.
Co-moderator John Dickerson called all six candidates on stage at once in South Carolina before introducing Marco Rubio, Jeb Bush, Donald...