Voters overwhelmingly lack confidence in both major parties.
Trump has scheduled a Tuesday news conference to release details.
The presumptive Republican presidential nominee already has Secret Service protection.
Carson slammed the "petty little differences" between the GOP and Libertarians.
"The WALL was very necessary!" he tweeted
Naomi Jagoda 05/30/16 07:50 AM EDT
Hillary Clinton has made more than 30 years of her returns public.
Bill Kristol has been trying to recruit a third-party conservative candidate.
Peter Sullivan 05/30/16 06:00 AM EDT
Clinton is facing the problem of higher ObamaCare premium hikes in an election year.
A former Rand Paul supporter says he'll revive his super-PAC for the Libertarian ticket.
"I thought this would be like Dr. Martin Luther King," Trump said.