Sen. John McCainJohn Sidney McCainLawmakers worry about rise of fake video technology Democrats put Dreamers and their party in danger by playing hardball Trump set a good defense budget, but here is how to make it better MORE — a Democrat?

There was confusion Wednesday after the Arizona Republican mistakenly strolled into President Obama’s meeting with Senate Democrats at the Capitol.

The room full of Democrats — who happened to be meeting in the same room where the Senate GOP usually holds their weekly policy luncheons — erupted in applause and laughter as the former Republican presidential candidate made his entrance.

As McCain, 76, walked out of the Dem-filled space, reporters pressed him as to why he stepped foot in the room.

Saying he “had to give a speech,” McCain was eyed walking away sporting a big grin.

Obama scheduled Wednesday powwows with House and Senate Democrats just ahead of Congress’ five-week recess.

McCain has emerged as a dealmaker in talks with Democrats, and has had numerous dustups this year with the Tea Party wing of the GOP. At one point he memorably described Sen. Rand PaulRandal (Rand) Howard PaulDem wins Kentucky state House seat in district Trump won by 49 points GOP's tax reform bait-and-switch will widen inequality Pentagon budget euphoria could be short-lived MORE (R-Ky.), Sen. Ted CruzRafael (Ted) Edward CruzOvernight Health Care: Trump eases rules on insurance outside ObamaCare | HHS office on religious rights gets 300 complaints in a month | GOP chair eyes opioid bill vote by Memorial Day HHS official put on leave amid probe into social media posts Trump, Pence to address CPAC this week MORE (R-Texas) and Rep. Justin AmashJustin AmashTrump, GOP at new crossroads on deficit Rand Paul revels in role of Senate troublemaker GOP lawmaker hits Trump over Dem memo: Americans deserve to read both MORE (R-Mich.) as “wacko birds.”

The senator on Wednesday joked it would a "difficult choice" for him if Paul and Democrat Hillary ClintonHillary Diane Rodham ClintonWoman behind pro-Trump Facebook page denies being influenced by Russians Trump: CNN, MSNBC 'got scammed' into covering Russian-organized rally Pennsylvania Democrats set to win big with new district map MORE were to face off for the presidency in 2016.

— Carlo Munoz contributed.

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