British Foreign Secretary Boris Johnson said on Wednesday that he was concerned about reports that U.S. President Donald Trump's would recognise Jerusalem as Israel's capital.

"Let's wait and see what the president says exactly. But, you know, we view the reports that we have heard with concern because we think that Jerusalem obviously should be part of the final settlement between the Israelis and the Palestinians," he told reporters in Brussels.

Senior U.S. officials said on Tuesday that Trump will recognise Jerusalem as Israel's capital on Wednesday and set in motion the relocation of the U.S. Embassy to the city.