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President Donald Trump is headed back to Europe, where on previous visits he has strained historic friendships and insulted his hosts. This time, he faces an ally in turmoil and a global call to renew democratic pacts.

The agenda for Trump's weeklong journey is both ceremonial and official: a state visit and an audience with Queen Elizabeth II in London, D-Day commemoration ceremonies on both sides of the English Channel and his first presidential visit to Ireland.

But the president will arrive at a precarious moment, as he faces a fresh round of impeachment fervor back home and uncertainty on the other side of the Atlantic Ocean.

British Prime Minister Theresa May steps down days after Trump visits as the government wrestles with its exit from the European Union.