Bolton told British Prime Minister Boris Johnson that President Donald Trump wants to see a successful British exit from the European Union on October 31 and that Washington will be ready to work fast on a U.S. -UK free trade agreement.
"At this stage, there is a lot of uncertainty about the sufficiency of enforcement in a no-deal because we have 12 vessels that need to monitor a space three times the size of the surface area of the United Kingdom".
Trump had wanted to work with the May government on a trade deal but her government "didn't want to do it".
Mr Bolton said he is "pleased" that Boris Johnson's government had agreed to participate in Operation Sentinel to improve security in the Persian Gulf, saying this "reflects a change from the prior government". We just felt we owe them that.
Britain's intelligence agencies expect close relations with European and other foreign spy services to continue regardless of plans to quit the European Union, official sources said.
A third British security source said worldwide inter-agency contacts will continue both bilaterally and through the "Counter Terrorism Group": an informal group of officials from domestic agencies, including Britain's MI-5, in all 28 European Union members, as well as Norway and Switzerland.
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They said this was a "very nuclear option" that would only be tried as a last resort, given the risk that this approach could backfire and lead to an election after a no-deal Brexit.
The likelihood of a no-deal Brexit has increased significantly since Boris Johnson was appointed Prime Minister of the United Kingdom, with Ireland's Minister for Fiance Paschal Donohoe recently saying that it is a "very credible and material risk now".
Pro-EU MPs can now only prevent No Deal by trying to take control of the parliamentary timetable or calling a vote of no confidence. Disruption can be kept to a minimum and we will recover more quickly.
The UK is due to leave the European Union on October 31.
Since Johnson's campaign for prime minister, Trump has been his outspoken advocate.
British Prime Minister Boris Johnson spoke to US President Trump on Monday, discussing Brexit, trade and economic issues, a statement from Johnson's office said.