UK defense chief: Thought of US isolationism 'keeps me awake at night'

U.K. Defense Secretary Ben Wallace expressed concern about a potential breakdown of the U.K.-U.S. relationship, saying the notion of a more isolationist U.S. “keeps me awake at night.”

"I worry if the United States withdraws from its leadership around the world,” Wallace told the Sunday Times, adding, "That would be bad for the world and bad for us. We plan for the worst and hope for the best."

"Over the last year we've had the US pull out from Syria, the statement by Donald TrumpDonald John TrumpNational Archives says it altered Trump signs, other messages in Women's March photo Dems plan marathon prep for Senate trial, wary of Trump trying to 'game' the process Democratic lawmaker dismisses GOP lawsuit threat: 'Take your letter and shove it' MORE on Iraq where he said NATO should take over and do more in the Middle East,” Wallace said.

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"The assumptions of 2010 that we were always going to be part of a US coalition is really just not where we are going to be. We are very dependent on American air cover and American intelligence, surveillance and reconnaissance assets. We need to diversify our assets," he continued.

Prime Minister Boris Johnson has announced the “deepest review” of the U.K.’s defense and foreign policy, which Wallace said should be used to investigate whether the country is less prepared for potential future conflicts.

"How we deliver defense cannot be dominated by sentimentality,” he told the newspaper. “We really have to embrace new technology."