“Maybe the policy is good, maybe it’s not,” Mr. Graves wrote on Twitter. “I’ll work through this ahead of the final vote later today.”
Senator Richard J. Durbin, Democrat of Illinois, signed the bill, but he noted by his signature that he did not endorse funding for border patrol agents and detention slots. Democrats say that by funding a daily average of 45,274 beds for detainees, they will force officers to reduce the number of migrants in detention from about 49,000 to 40,000 by the end of the fiscal year.
But with up to $750 million available to be shifted to detention and latitude for federal agencies in how funds are used, Republicans say the number could actually increase to as many as 58,500 beds.
Mr. Trump’s expected signature will not completely resolve the funding debates, as the president looks for ways to appease his supporters who rallied around his promise to “build the wall.”
Republicans, including Mr. McConnell, have stressed to Mr. Trump and their hard-line immigration critics that they see the $1.375 billion for physical barriers as a “down payment” for investments to come. Senator Richard C. Shelby of Alabama, chairman of the Senate Appropriations Committee, said Wednesday that “this is only the beginning of a multiyear effort.”
But with Democrats in charge of the House, the fight over congressional funding for the wall may, in fact, be over. House Democrats, wielding both oversight and the congressional power of the purse, have warned against efforts to subvert their funding limits on detention beds, border barriers and other matters. The spending bill provides for oversight of ICE, and places numerous limits on the agency, outlining protections for pregnant detainees, requirements for publicizing data about who is in custody and prohibitions on destroying records.
They have also said that they plan to push for a higher pay increase for federal workers and to introduce legislation that would address Mr. Trump’s efforts to curb immigration: restoring the crucial protections under Temporary Protected Status, or T.P.S., and offering additional protections to the roughly 700,000 young undocumented immigrants brought to the country as children, known as Dreamers.