"Whine" about how the process is rigged?
He's been ambushed by the republican establishment repeatedly over the last couple months. It's clearly rigged. They even tried to pull out Mitt Romney before Trump blew him out of the water.
Yeah, he's whining, bitching, and complaining about rules that were set in every state last August. He knew the rules in CO, and even scheduled an appearance at the state's delegate convention, and cancelled it two days prior. Cruz does make an appearance, and wins every delegate election with the majorities of 65,000 votes. Trump pretends there wasn't any elections whatsoever, and whines about how 'The Game Is Rigged!'
He wins 100% of the delegates in Florida with 43% of the vote... no whining.
He wins most of the states with open voting, so Democrats and Independents can crossover and vote for him... no whining.
He's won 43% of the delegates with 35% of the vote throughout all of the states so far... no whining.
And after every... seriously, every... defeat he's had to Cruz, the same whining of 'Voter Fraud!' or other accusation that the victory was somehow cheated from him.
He's quite comfortable when 'the game is rigged' in his favor. But the game wasn't rigged, he won those states and delegates, just as Cruz won every single delegate he currently has.
Trump is an outsider that hasn't figured out the insider tactics of winning the nomination. Because if he doesn't win 1237 delegates for the 1st ballot, the only ballot they're required to stay with him, then many will abandon him for another candidate they prefer.
Remember, Trump won every FL delegate, with 43% of the vote. Don't ya think many of them are going to jump ship? I bet that's the state that most of them will abandon him during the 2nd ballot.
As for 'Oh, the Washington Establishment is attacking Trump!' Um.... yeah, because they probably don't want Hillary to be the next President. And with every single poll for the last 6 months showing Hillary beating Trump, along with a negative rating of 70% among women, and very high negatives among every minority group... yeah, they have reason to want Trump to GTFO.