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Mr. Kyl and Mr. Turner said that Mr. Obama promised to request full funding and to accelerate building a new chemistry and metallurgy research nuclear facility, but the funding cuts delayed construction from 2021 to 2028 at the earliest.

“This is all an unnecessary risk, because alternative funding sources have been proposed to the administration,” they stated.

“When we find ourselves replacing antiquated vacuum tubes with modern circuit boards, the risk of further delays in warhead-life extension is too great.”

Another major worry identified by the two lawmakers: “Our decades-old, land-based missile force remains without a proper replacement plan — contrary to The Post’s suggestion — while countries such as Russia and China deploy new missiles.”

“It is more than fair to criticize the president’s failure to honor his commitments; the future of the U.S. nuclear deterrent and extended deterrent is at risk,” they said.