Trump's unique relationship with Chuck Schumer takes another turn

President-elect Donald Trump slammed his political opponent and incoming Senate Minority Leader Chuck Schumer (D-N.Y.) Thursday morning using his favorite vehicle of communication: Twitter.

This is just the latest turn in a very complex relationship between the two New Yorkers, and it's likely a response to Schumer's promise to lead the Democratic efforts to undermine Trump's Cabinet selections as much as possible. The Democratic leader also called Trump "really dumb" Wednesday for expressing skepticism about U.S. intelligence agencies and their assessment of Russian hacking.

Prior to this, however, Trump tweeted that he was pleased that Schumer won the vote for Senate minority leader:

Of course, prior to his presidential run, the senator to whom Trump had donated the most money was none other than Schumer. And on Tuesday, Schumer confirmed to reporters that Trump had told him he liked the New York Democrat more than his Republican compatriots and named House Speaker Paul Ryan (R-Wis.) as an example. Even as far back as January 2016, during the primaries, Trump was touting his ability to get along with everyone, including House Minority Leader Nancy Pelosi (D-Calif.) and then-Senate Majority Leader Harry Reid (D-Nev.), and bragging that he was "close" to Schumer "in many ways."

Given their choppy and complex relationship, we're likely to see more fireworks as they butt heads.