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“TPA remains one of our primary concerns,” Ms. Hamel said. “We haven’t given up on getting an extension.”

But House Ways and Means spokesman Matthew Beck says the administration “has not been brought up the issue” recently, and that the committee has no plans to move on granting an extension.

A senior Senate Democratic aide added the administration has done little to make its case heard on Capitol Hill.

“They’re not pushing this at all — not in a way you would consider ‘pushing,’ ” the aide said. “ ’Pushing it’ means shoe leather and phones calls, and we’re just not getting that from them on this.”