Trump says Republican leaders better get used to him being in the race

Donald Trump said Republican leaders better get used to him being in the race.

He then gave another warning that he may run as a third-party candidate if he does not get the nomination.

Trump said he has been hearing rumors of a brokered convention where party officials, not voters actually choose the nominee.

He said if true it would violate an agreement he signed saying he would not run as a third-party candidate.

While Trump is leading nationally, he is now trailing in Iowa.