Sen. Dan CoatsDaniel (Dan) Ray CoatsTrump urges House to reauthorize NSA surveillance after ripping it in a tweet Overnight Cybersecurity: Computer chip flaws present new security challenge | DOJ to offer House key documents in Russia probe | Vulnerability found in Google Apps Script Counterterrorism director: Current atmosphere makes job 'more difficult' MORE (R-Ind.) accidentally sat in on the wrong hearing Wednesday and didn't realize until after he asked a witness a lengthy question. 

“I just got a note saying I’m at the wrong hearing,” Coats said more than an hour into it. 

Coats entered the Senate Appropriations subcommittee on general government late, just a few minutes before he started speaking and discovered his mistake. 

On Thursday, Coats joked about his mistake on Twitter, and said he suspects Russians have been tampering with his schedule.

Before the discovery, Chairman Tom Udall (D-N.M.) offered the Indiana lawmaker an opportunity to ask the witnesses a question. 

Coats went on to praise a Pentagon undersecretary for his prompt response to a letter the senator sent about the Indiana National Guard. Lawmakers, however, were examining the Treasury Department’s budget for the office of terrorism and financial intelligence.

According to The Washington Post, Coats was supposed to be at an appropriations hearing on the budgets for the Defense Department and Army down the hall. 

“I’ve got the right room number but the wrong hearing,” Coats said. “Well, this is the first time this has ever happened to me,” he added. 

Coats, 70, served in the Senate from 1989–1999, and was reelected to Congress in 2010. Between his congressional stints, he served as U.S. Ambassador to Germany. He’s up for reelection in 2016.