Arizona is the biggest prize for both parties Tuesday night.
Residents in three Western states are casting their picks as national security once again is a hot-button issue.
Twin explosions in Brussels will test how the contenders would protect the U.S. as president.
Trump needs to win around 55 percent of the remaining delegates to avoid a contested Republican convention in July.
An ex-model. A former NFL cheerleader. Stay-at-home moms. Even a former president.
Trump is busting ideological barriers. It's a political winner.
At a Wednesday town hall, the senator said he hypothetically wouldn't agree to the second-highest position in the U.S.
The Miami contest comes ahead of the crucial March 15 Florida primary.
The three White House wannabes would all likely face a skeptical, even hostile Congress. That means gridlock. Or mayhem.
What's key to winning the White House is how the contest plays out in the battleground states.
It should not be assumed that denying Trump a first-ballot nomination means completely denying him the nomination.
Many mainstream Republicans are reluctant to rally behind Cruz, teh alternative to Trump, as they see him as too conservative.