The US primary elections are gearing up to go into overdrive, with Super Tuesday looming. Next week 12 states will head to the ballots to make their pick for the candidate they want to run for President.
The biggest state is Texas and the battle is on.
Marco Rubio wants the Republican nomination -- he wants to be president. But to get there he'll have to get past Donald Trump.
Mr Rubio's message today is that Mr Trump is too "angry" to be trusted with America's nuclear arsenal.
But Mr Trump's on a roll -- taking out Nevada and making it three in a row.
"We weren't expected to win too much and now we're winning, winning, winning the country," Mr Trump said yesterday.
In Nevada, he took out 46 percent of the vote, while Mr Rubio narrowly edged out Ted Cruz with 24 percent over his 21 percent.
Mr Rubio, the son of Cuban immigrants, is young, fresh and thought to be the best chance of beating Mr Trump.
He wants other candidates to drop out and stop splitting the vote.