The long-awaited lawsuit was filed on Friday.
The House will act, he said.
In a victory for environmental activists, Democrats blocked legislation to compel construction of the oil pipeline, but the vote leaves Republicans itching to return to the fight when they take over next year.
The embattled Louisiana senator believes the cliffhanger vote is critical to her reelection bid.
The incoming Senate majority leader has pledged no government shutdowns on his watch, but conservative lawmakers are looking for a way to block the president’s expected executive action on immigration.
At least six Democrats rejected Sen. Harry Reid’s bid for another leadership term during an emotional meeting following last week’s midterm losses.
A chastened Senate Majority Leader Harry M. Reid expanded his leadership team Thursday, including the addition of liberal icon Elizabeth Warren, to beat back internal critics.
The party is heading into what looks to be a tough campaign cycle.
Leaders of Congress remained unchallenged, but the fight for lesser posts could be telling.
DEBRIEF | Staffers normally do not say certain things on the record about a sitting president, especially when they are from the same party.