If Donald Trump reaches March 15 with a substantial lead in the polls, it will be difficult for any other Republican candidate to catch him.
Is Donald Trump nearing a tipping point after which it will be difficult for any other Republican to pass him in the presidential nomination race?
22:46 Cupp: Democrats will definitely turn on Mueller38
01:08 Prepare for the weirdest Election Day in history, after a candidate allegedly body-slams a reporter19
22:11 THE MEMO: Trump seeks fresh start with wary Europe12
14:15 Trump Expected to Endorse NATO Mutual Aid Pledge, Ending Silence10