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The two new senators, along with other newly elected members of Congress, are in Washington, D.C., for orientation this week. The Senate is back in session, for the first time following last week's election, as of Tuesday.

McCaskill, who earlier this week tweeted that it was "gonna be fun walking on the floor of the Senate" after winning a tough race in Missouri, seemed to appreciate the coincidence of a women-only "power meeting" happening in the Senate bathroom. 

"Gonna need a bigger bathroom," she tweeted.

Sen. Amy KlobucharAmy KlobucharFCC: Over 12,000 callers couldn’t reach 911 during AT&T outage Live coverage: Day three of Supreme Court nominee hearing Dems land few punches on Gorsuch MORE (D-Minn.) later experienced a similar "traffic jam" in the women's restroom.

The percentage of women in the Senate is now 20 percent, counting the women elected last Tuesday — an historic high.

Updated at 4:01 p.m.