President Trump lashed out at Senate Majority Leader Mitch McConnell on Twitter this afternoon over the Senate's failure to pass legislation repealing and replacing the Affordable Care Act:

Why it matters: This has turned into an intra-party fight over what was supposed to be Trump's first piece of major legislation. And Trump himself jumping into the fray takes things to the next level, though it could have been expected after Dan Scavino, the White House Director of Social Media, took a shot at McConnell on his personal Twitter account earlier today: