Senate Majority Leader Harry Reid (D-Nev.) today accused his GOP counterparts of trying to hold votes later this evening to shield Sen. Scott Brown (R-Mass.) from debating his Democratic opponent, Elizabeth Warren.

“I’m sorry. We have no more votes today. It’s obvious to me what’s going on. I’ve been to a few of these rodeos,” Reid said. “It’s obvious there’s a big stall taking place. One of the Senators who doesn’t want to debate tonight won’t be in the debate. Well, he can’t used the Senate as an excuse. There will be no more votes today.”

Brown and Warren, whom Reid urged to run for Senate, are set to debate each other for the first time at 7 p.m. today.

“He’s on his way to the airport,” Brown campaign spokesman Colin Reed said. “He’ll be on a 4:30 p.m. flight, and he looks forward to debating Elizabeth Warren.”

Four recent polls found Warren leading Brown, while a fifth found the incumbent with a slight advantage.

Earlier today, local media reported that powerful Boston Mayor Tom Menino will endorse Warren on Friday. Menino, who controls a powerful get-out-the-vote operation, had been mum on who would he endorse for months.

Joshua Miller contributed to this post.