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The US government has pressured telcos to rip out network gear made by Chinese companies Huawei and ZTE but has allocated only about 38 percent of the money needed to replace equipment with non-Chinese hardware, the Federal Communications Commission said.

FCC Chairwoman Jessica Rosenworcel wrote to Congress Thursday, urging lawmakers to fully fund the program. Congress allocated $1.9 billion for replacements of Chinese gear that must be removed as early as this month, but the needed reimbursements add up to nearly $5 billion, Rosenworcel wrote.

“I am writing… to emphasize again the urgent need for full funding of the Reimbursement Program,” she wrote. Rural mobile carriers could have to withdraw from the reimbursement program or even shut down networks if the funding shortfall isn’t closed, the letter said.