John Bolton, U.S. President Donald Trump’s national security adviser, arrived in London on Sunday for talks at which he is expected to urge Britain to toughen its stance on Iran and Chinese telecommunications firm Huawei.

Axar.az reports citing Reuters.

As the United Kingdom prepares to leave the European Union on Oct. 31, its biggest geopolitical shift since World War Two, many diplomats expect London to become increasingly reliant on the United States.

Bolton’s two days of talks on Monday and Tuesday, to include a heavy focus on Brexit, reflect the Trump White House’s attempts to solidify ties with the new British government of Prime Minister Boris Johnson after Trump’s strained relationship with former Prime Minister Theresa May.

Bolton is expected to urge British officials to align policy on Iran more closely with that of Washington, which has pressured Tehran with ever-tightening sanctions after Trump withdrew the United States from the Iran nuclear deal.

Britain has so far backed the European Union in sticking with the nuclear accord, known as the Joint Comprehensive Plan of Action, but the seizure of a British oil tanker in the Strait of Hormuz has put pressure on London to consider a tougher stance.

British marines seized an Iranian vessel, which is suspected of smuggling oil to Syria, off the coast of Gibraltar on July 4. This month, Britain joined the United States in a maritime security mission in the Gulf to protect merchant vessels.

A senior Trump administration official said Bolton’s argument to the British will be that it would help add pressure on Iran if London would declare the JCPOA dead but that such a decision was not expected soon.