WASHINGTON—Top lawmakers said they reached a tentative agreement on federal government spending, giving Congress and the White House about a week to approve the particulars before funding runs out after Dec. 20.

“There’s a meeting of the minds,” said House Appropriations Chairwoman Nita Lowey (D., N.Y.).

The agreement follows a meeting between House Speaker Nancy Pelosi (D., Calif.), Treasury Secretary Steven Mnuchin and the leaders of the two committees on Thursday.

Leaving that meeting, Mr. Mnuchin said that negotiators were focusing on a small list of remaining issues and that he planned to update President Trump on the talks later Thursday.

The details of the agreement, which covers nearly $1.4 trillion in government spending across a dozen bills, weren’t immediately known.

White House officials didn’t immediately respond to a request for comment.

Before the announcement of a deal, lawmakers and a White House official said that the two sides were approaching a resolution on the most contentious spending issue: a border wall along the U.S.-Mexico border. Under a proposal weighed during the negotiations, Congress would approve roughly the same amount of funding it did last fiscal year for building the wall—$1.38 billion—while leaving the president’s ability to redirect government funds untouched.

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