NBC First Read:

Speaking of delegate fights, Donald Trump upped the ante over the weekend by tweeting the threat of a lawsuit over last week’s maneuvering in Louisiana’s GOP delegate selection. “Just to show you how unfair the Republican primary politics can be, I won the State of Louisiana and get less delegates than Cruz – Lawsuit coming,” he wrote. Now, Louisiana is simply an example of Trump being outgunned when it comes to the nitty-gritty of delegate selection at the local level, and Team Cruz worked within the rules – not outside of them – to build a possible advantage. But for Trump’s supporters, the complaint furthers the fundamental underpinning of their candidate’s appeal – that he’s fighting an unfair and rigged establishment system to better represent the folks who have been most left out of the process.