Senate Democrats, Republicans Make Power-Sharing Deal

The Senate has passed a resolution to organize the Chamber, with Majority Leader Chuck Schumer and Minority Leader Mitch McConnell agreeing on a power-sharing deal. This agreement mirrors the one from 2001, the last time the Senate was evenly split. Democrats regained the majority after the Georgia runoff elections, allowing them to take control of committees.

What event allowed Democrats to regain the majority in the Senate?

What does the agreement allow Democrats to control?