Mitch McConnell's prolonged hospital stay — with no end in sight — has created a critical problem for Donald Trump's military spending agenda.The former Senate Majority Leader, who chairs the Senate Appropriations Committee controlling Pentagon spending, has been hospitalized for weeks with no expected return to Congress in sight. His absence couldn't come at a worse time—Trump is pushing hard for a new Pentagon budget before the midterms, and McConnell's support is essential to making it happen, according to a report from Politico.McConnell's staff insists he remains "engaged" with Senate Republicans and "working closely with his staff," according to a Tuesday statement to reporters. But GOP leadership is largely in the dark about his condition and timeline for return and that has the Republican caucus on edge.The timing is exasperating for a the White House that is pushing for a third party-line budget reconciliation measure that would supply approximately $350 billion in additional Defense Department funding, according to the report. Lawmakers are already moving a fiscal 2027 spending bill that would provide a record $1.15 trillion military budget. McConnell's backing would be crucial to moving either proposal forward—his absence could stall or kill those hopes entirely.Technically, the White House doesn't need McConnell's vote to advance a third reconciliation bill. But his hospitalization adds another layer of complication to an already difficult math problem. Senate Majority Leader John Thune (R-SD) is struggling to convince 50 of his 53 members to back any plan. With McConnell sidelined, Thune can afford to lose only two senators.According to Politico, Thune hasn't even committed to pushing a third bill, making clear he doesn't yet see a viable plan that can pass. Most Senate Republicans want to see what emerges from the House first—creating delays that work against Trump's midterm deadline.McConnell has been a powerful critic of the administration's military spending approach, making his absence particularly consequential. Even if he eventually returns, his weeks away from the Capitol have disrupted the crucial negotiations needed to advance Trump's Pentagon agenda before the pivotal November midterms.