Donald Trump lashed out at Sen. Jeff Flake on Sunday after the Republican from Arizona said he wasn't ready to vote for Trump.
"The Republican Party needs strong and committed leaders, not weak people such as @JeffFlake, if it is going to stop illegal immigration," Trump said on Twitter Sunday night.
He then tweeted an hour later: "The Great State of Arizona, where I just had a massive rally (amazing people), has a very weak and ineffective Senator, Jeff Flake.
Sad!"
In an interview with Jake Tapper on CNN's "State of the Union," Flake, a vocal Trump detractor, said he "simply can't" support Trump.
