Could someone explain how having a majority would impact the ability to sue people?
Aren't the courts separate from the house of representatives?
In the majority, Democrats would have the ability to sue the Trump administration in a more effective way since they have not had standing to do so in the minority. Whether it is compelling testimony from a top administration official, escalating a fight over obtaining documents or trying to halt the construction of Trump’s White House ballroom, Democrats plan to be strategic and aggressive about taking their fight to court.
Eta: Thanks all. I read the article again after the replies and noticed something I missed:
But Democrats say they are not deterred by that, including a recent decision by the Supreme Court that cleared the way for Trump to continue construction of his massive new ballroom project at the White House, concluding that a preservation group lacked the legal right — known as standing — to challenge the project.
A different article explained the particulars:
One of the government’s principal arguments in the case is that the Trust lacks the legal right – known as “standing” – to sue in the first place. Lower courts have said that the Trust has standing because one of its members, Alison Hoagland, has shown that her enjoyment of the White House as an architectural historian is being harmed by the new ballroom.
As others noted the idea might be that if they are bringing suit about the office of the president ignoring congress, then if they sue as congress (by having the majority) it would be less likely to be challenged as not having standing.
Off topic but in the rest of the world we hear about how easy it is to sue in the states... but it seems it's a lot easier for orgs to sue on behalf of others outside of the states!