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He said the UK government had been "very supportive" and discussions with he US State Department had been "encouraging".

On March 31, State Department spokesperson Tammy Bruce said any adjustment to U.S. policy on Syria would be contingent on the government’s actions, including guaranteeing the rights of minorities.

As a result, the State Department revoked the work and tourist visas of band members, wrote Landau, who served as ambassador to Mexico during part of President Trump’s first term.

He added that he thought that it was not President Trump but the US State Department which had taken the decision.

The US has not declared the three Americans to be wrongfully jailed in DR Congo but the State Department said previously there have been talks between the countries over the matter.