London transport union RMT announced on Tuesday that its workers would go on strike next month — a timing that coincides with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's visit to the British capital.

Workers for the union announced they would walk out on July 11 and July 14 over a disagreement with the local government body, Transport for London, citing "appalling working conditions."

Trump is set to arrive in London on July 13, marking his first official visit to the city since taking office.

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The strike is expected to impact the Piccadilly Line, which runs through central London to Heathrow Airport, and carries nearly half a million passengers daily.

Thousands of demonstrators are expected to take to the streets of London to protest Trump's visit, which, coupled with the strike, could likely result in extremely crowded conditions in the heart of the city.

London Mayor Sadiq Khan, who has publicly clashed with Trump in the past, hinted in April that there could be protests in London during the president's visit.

"If he comes to London, President Trump will experience an open and diverse city that has always chosen unity over division and hope over fear. He will also no doubt see that Londoners hold their liberal values of freedom of speech very dear," Khan said.

Trump is set to meet with British Prime Minister Theresa May, as well as Queen Elizabeth II, according to U.S. Ambassador to the U.K. Robert Wood Johnson.