The Senate blocked President Trump from being able to make recess appointments on Thursday as lawmakers leave Washington for their August break.
The move, which requires the agreement of every senator, means the Senate will be in session every three business days throughout the August recess.
The Senate left D.C. on Thursday evening with most lawmakers not expected to return to Washington until after Labor Day.
Senators were scheduled to be in town through next week, but staffers and senators predicted they would wrap up a few remaining agenda items and leave Washington early.
Trump isn’t the first president to face the procedural roadblock from Congress.
Senate Minority Leader Charles Schumer (D-N.Y.) warned last month that Democrats had “tools in our toolbox” to block a recess appointment.
“We’re ready to use every single one of them, any time, day or night. It’s so vital to the future of the republic,” he said.
“So to meet our constitutional requirement of meeting every few days, we’re doing pro formas. We didn’t do it to block Trump,” the aide said.
Under Article One of the Constitution “neither House, during the session of Congress, shall, without the consent of the other, adjourn for more than three days.” The House is also currently holding pro-forma sessions.
“My understanding is that we will only recess for three days at a time. …When we were in the majority I had to come down from Delaware and preside,” he said.
Trump also needs to find a new secretary of Homeland Security after he named John Kelly his new chief of staff.
The GOP-controlled Senate also held pro-forma sessions over the week-long Fourth of July recess.
And Democrats held pro-forma sessions every three days in 2012 when Obama tried to appoint National Labor Relations Board members. The Supreme Court ruled in 2014 that he overstepped his constitutional authority.
Asked if he was now glad the NLRB case had been litigated, Coons added on Thursday to laughter: “I think it’s important that there be restraints on the recess appointments.”